Method for receiving pusch in wireless communication system and apparatus therefor

ABSTRACT

A method for receiving, by a base station, a physical uplink shared channel (PUSCH) in a wireless communication system includes: transmitting a first message including information related to a configuration of a multi-TU PUSCH transmitted in a plurality of time units (TUs); transmitting a second message related to a spatial relation RS applied to the transmission of the multi-TU PUSCH; and receiving the multi-TU PUSCH. The plurality of time units (TUs) are classified into a plurality of TU groups, and the second message includes information indicating at least one spatial relation RS applied to each TU group among the plurality of TU groups.

TECHNICAL FIELD

The present disclosure relates to a method for receiving a PUSCH in awireless communication system and an apparatus therefor.

BACKGROUND ART

A mobile communication system has been developed to provide a voiceservice while ensuring the activity of a user. However, the area of themobile communication system has extended to a data service in additionto a voice. Due to the current explosive increase in traffic, there is ashortage of resources, and thus users demand a higher speed service.Accordingly, there is a need for a more advanced mobile communicationsystem.

Requirements for a next-generation mobile communication system need tobe able to support the accommodation of explosive data traffic, adramatic increase in the data rate per user, the accommodation of asignificant increase in the number of connected devices, very lowend-to-end latency, and high energy efficiency. To this end, varioustechnologies, such as dual connectivity, massive multiple input multipleoutput (MIMO), in-band full duplex, non-orthogonal multiple access(NOMA), super wideband support, and device networking, are researched.

DISCLOSURE Technical Problem

The present disclosure proposes a method for receiving a PUSCH in aplurality of time units and an apparatus therefor.

Technical objects to be achieved by the present disclosure are notlimited to the aforementioned technical objects, and other technicalobjects not described above may be evidently understood by a personhaving ordinary skill in the art to which the present disclosurepertains from the following description.

Technical Solution

According to an embodiment of the present disclosure, a method forreceiving, by a base station, a physical uplink shared channel (PUSCH)in a wireless communication system includes: transmitting a firstmessage including information related to a configuration of a multi-TUPUSCH transmitted in a plurality of time units (TUs); transmitting asecond message related to a spatial relation RS applied to thetransmission of the multi-TU PUSCH; and receiving the multi-TU PUSCH.The plurality of time units (TUs) may be classified into a plurality ofTU groups, and the second message may include information indicating atleast one spatial relation RS applied to each TU group among theplurality of TU groups.

The time unit (TU) may be defined in units of a slot or a symbol.

At least one spatial relation RS applied to the each TU group may berelated to at least one layer of all layers related to the transmissionof the multi-TU PUSCH.

The all layers are classified into a plurality of layer groups includingat the at least one layer, and at least one spatial relation RS appliedto each TU group is applied to each layer group among the plurality oflayer groups.

At least one spatial relation RS applied to the each TU group may beapplied to the all layers.

The first message may further include a list of a plurality of relationstates, a constitution of each spatial relation state included in thelist may be configured by a multiple access control-control element (MACCE), and the spatial relation state may be comprised of at least onespatial relation RS applied to the plurality of TU groups.

The second message may be Downlink Control Information (DCI), and theinformation indicating at least one spatial relation RS may be relatedto any one spatial relation state of the plurality of spatial relationstates.

The first message may further include information on spatial relationRSs applied to the plurality of TU groups, and the informationindicating at least one spatial relation RS may indicate a spatialrelation RS to be applied as a default.

The first message may further include information on remaining spatialrelation RSs other than at least one specific spatial relation RS of thespatial relation RSs applied to the plurality of TU groups, and theinformation indicating the at least one spatial relation RS may berelated to the at least one specific spatial relation RS, and thespecific spatial relation RS may be applied to a specific TU group ofthe plurality of TU groups.

The at least one spatial relation RS may be mapped to TUs which belongto the each TU group and the mapped spatial relation RS may be changedfor each TU among the TUs.

The at least one spatial relation RS may be mapped to the TUs whichbelong to the each TU group and the mapped spatial relation RS may bechanged for each TU group.

The at least one spatial relation RS may be mapped to the TUs whichbelong to the each TU group and the mapped spatial relation RS may bechanged every at least two TUs of the TUs.

The second message may be downlink control information (DCI) forscheduling the transmission of the multi-TU PUSCH or may be downlinkcontrol information (DCI) or a multiple access control (MAC) controlelement (CE) for activating semi-persistent transmission of the multi-TUPUSCH.

According to another embodiment of the present disclosure, a basestation for receiving a Physical Uplink Shared Channel (PUSCH) in awireless communication system includes: one or more transceivers; one ormore processors; and one or more memories operably connectable to theone or more processors, and storing instructions of performingoperations when executed by the one or more processors. The operationsinclude transmitting a first message including information related to aconfiguration of a multi-TU PUSCH transmitted in a plurality of timeunits (TUs), transmitting a second message related to a spatial relationRS applied to the transmission of the multi-TU PUSCH, and receiving themulti-TU PUSCH. The plurality of time units (TUs) are classified into aplurality of TU groups, and the second message includes informationindicating at least one spatial relation RS applied to each TU groupamong the plurality of TU groups.

The time unit (TU) may be defined in units of a slot or a symbol.

According to yet another embodiment of the present disclosure, anapparatus includes: one or more memories; and one or more processorsfunctionally connected to the one or more memories. The one or moreprocessors are configured to control the apparatus to: transmit a firstmessage including information related to a configuration of a multi-TUPUSCH transmitted in a plurality of time units (TUs), transmit a secondmessage related to a spatial relation RS applied to the transmission ofthe multi-TU PUSCH, and receive the multi-TU PUSCH. The plurality oftime units (TUs) are classified into a plurality of TU groups, and thesecond message includes information indicating at least one spatialrelation RS applied to each TU group among the plurality of TU groups.

Advantageous Effects

According to an embodiment of the present disclosure, in relation to aconfiguration of a PUSCH transmitted in a plurality of time units (TUs)(multi-TU PUSCH), the plurality of TUs are classified into a pluralityof TU groups. A base station can indicate at least one spatial relationRS applied to the transmission of the multi-TU PUSCH every each TUgroup. The base station can receive a PUSCH through different beams foreach TU group. Accordingly, the present disclosure can increase acommunication success probability even when a quality of a link betweena specific transmission beam of a UE and the base station deteriorates.

Further, according to an embodiment of the present disclosure, a spatialrelation RS applied for each TU group can be sequentially indicatedthrough a first message and a second message. A signaling overheadrequired for indicating the spatial relation RS can be reduced.

Further, according to an embodiment of the present disclosure, thespatial relation RS for the plurality of TU groups is mapped accordingto a specific mapping rule. Therefore, a spatial relation RS indicatedfor receiving the multi-TU PUSCH can be mapped to each TU (group) tosuit a UE capability related to a beam switching delay, a powertransition time, etc.

Effects which may be obtained by the present disclosure are not limitedto the aforementioned effects, and other technical effects not describedabove may be evidently understood by a person having ordinary skill inthe art to which the present disclosure pertains from the followingdescription.

DESCRIPTION OF DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the disclosure and constitute a part of the detaileddescription, illustrate embodiments of the disclosure and together withthe description serve to explain the principle of the disclosure.

FIG. 1 illustrates an example of an overall structure of an NR system towhich a method proposed in the disclosure may be applied.

FIG. 2 is a flowchart illustrating an example of a CSI-relatedprocedure.

FIG. 3 is a concept view illustrating an example of a beam-relatedmeasurement model.

FIG. 4 is a diagram illustrating an example of a DL BM procedure-relatedTx beam.

FIG. 5 is a flowchart illustrating an example of a DL BM procedure usingan SSB.

FIG. 6 is a diagram illustrating an example of a DL BM procedure using aCSI-RS.

FIG. 7 is a flowchart illustrating an example of a received beamdetermination process of a UE.

FIG. 8 is a flowchart illustrating an example of a method ofdetermining, by a base station, a transmission beam.

FIG. 9 is a diagram illustrating an example of resource allocation intime and frequency domains related to the operation of FIG. 6.

FIG. 10 is a flowchart illustrating an example of a beam failurerecovery procedure.

FIGS. 11 and 12 illustrate examples of scheduling for cell cyclinguplink transmission according to an embodiment of the presentdisclosure.

FIG. 13 illustrates an example of performing the cell cycling uplinktransmission in units of a symbol group according to an embodiment ofthe present disclosure.

FIG. 14 illustrates an example of a muting operation during the cellcycling uplink transmission according to an embodiment of the presentdisclosure.

FIG. 15 is a flowchart for describing a method for receiving, by a basestation, a PUSCH according to an embodiment of the present disclosure.

FIG. 16 illustrates a communication system 1 applied to the presentdisclosure.

FIG. 17 illustrates a wireless device applicable to the presentdisclosure.

FIG. 18 illustrates a signal processing circuit applied to the presentdisclosure.

FIG. 19 illustrates another example of a wireless device applied to thepresent disclosure.

FIG. 20 illustrates a hand-held device applied to the presentdisclosure.

MODE FOR DISCLOSURE

Reference will now be made in detail to embodiments of the disclosure,examples of which are illustrated in the accompanying drawings. Whereverpossible, the same reference numbers will be used throughout thedrawings to refer to the same or like parts. In general, a suffix suchas “module” and “unit” may be used to refer to elements or components.Use of such a suffix herein is merely intended to facilitate descriptionof the disclosure, and the suffix itself is not intended to give anyspecial meaning or function. It will be noted that a detaileddescription of known arts will be omitted if it is determined that thedetailed description of the known arts can obscure the embodiments ofthe disclosure. The accompanying drawings are used to help easilyunderstand various technical features and it should be understood thatembodiments presented herein are not limited by the accompanyingdrawings. As such, the disclosure should be construed to extend to anyalterations, equivalents and substitutes in addition to those which areparticularly set out in the accompanying drawings.

In the present disclosure, a base station (BS) means a terminal node ofa network directly performing communication with a terminal. In thepresent disclosure, specific operations described to be performed by thebase station may be performed by an upper node of the base station, ifnecessary or desired. That is, it is obvious that in the networkconsisting of multiple network nodes including the base station, variousoperations performed for communication with the terminal can beperformed by the base station or network nodes other than the basestation. The ‘base station (BS)’ may be replaced with terms such as afixed station, Node B, evolved-NodeB (eNB), a base transceiver system(BTS), an access point (AP), gNB (general NB), and the like. Further, a‘terminal’ may be fixed or movable and may be replaced with terms suchas user equipment (UE), a mobile station (MS), a user terminal (UT), amobile subscriber station (MSS), a subscriber station (SS), an advancedmobile station (AMS), a wireless terminal (WT), a machine-typecommunication (MTC) device, a machine-to-machine (M2M) device, adevice-to-device (D2D) device, and the like.

In the following, downlink (DL) means communication from the basestation to the terminal, and uplink (UL) means communication from theterminal to the base station. In the downlink, a transmitter may be apart of the base station, and a receiver may be a part of the terminal.In the uplink, the transmitter may be a part of the terminal, and thereceiver may be a part of the base station.

Specific terms used in the following description are provided to helpthe understanding of the present disclosure, and may be changed to otherforms within the scope without departing from the technical spirit ofthe present disclosure.

The following technology may be used in various wireless access systems,such as code division multiple access (CDMA), frequency divisionmultiple access (FDMA), time division multiple access (TDMA), orthogonalfrequency division multiple access (OFDMA), single carrier-FDMA(SC-FDMA), non-orthogonal multiple access (NOMA), and the like. The CDMAmay be implemented by radio technology such as universal terrestrialradio access (UTRA) or CDMA2000. The TDMA may be implemented by radiotechnology such as global system for mobile communications (GSM)/generalpacket radio service (GPRS)/enhanced data rates for GSM evolution(EDGE). The OFDMA may be implemented as radio technology such as IEEE802.11(Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (evolved UTRA),and the like. The UTRA is a part of a universal mobile telecommunicationsystem (UMTS). 3rd generation partnership project (3GPP) long termevolution (LTE), as a part of an evolved UMTS (E-UMTS) using E-UTRA,adopts the OFDMA in the downlink and the SC-FDMA in the uplink. LTE-A(advanced) is the evolution of 3GPP LTE.

Embodiments of the present disclosure may be supported by standarddocuments disclosed in at least one of IEEE 802, 3GPP, and 3GPP2 whichare the wireless access systems. That is, steps or parts in theembodiments of the present disclosure which are not described to clearlyshow the technical spirit of the present disclosure may be supported bythe standard documents. Further, all terms described in this documentmay be described by the standard document.

3GPP LTE/LTE-A/New Radio (NR) is primarily described for cleardescription, but technical features of the present disclosure are notlimited thereto.

Definition of Terms

eLTE eNB: The eLTE eNB is the evolution of eNB that supportsconnectivity to EPC and NGC.

gNB: A node which supports the NR as well as connectivity to NGC.

New RAN: A radio access network which supports either NR or E-UTRA orinterfaces with the NGC.

Network slice: A network slice is a network created by the operatorcustomized to provide an optimized solution for a specific marketscenario which demands specific requirements with end-to-end scope.

Network function: A network function is a logical node within a networkinfrastructure that has well-defined external interfaces andwell-defined functional behaviour.

NG-C: A control plane interface used on NG2 reference points between newRAN and NGC.

NG-U: A user plane interface used on NG3 references points between newRAN and NGC.

Non-standalone NR: A deployment configuration where the gNB requires anLTE eNB as an anchor for control plane connectivity to EPC, or requiresan eLTE eNB as an anchor for control plane connectivity to NGC.

Non-standalone E-UTRA: A deployment configuration where the eLTE eNBrequires a gNB as an anchor for control plane connectivity to NGC.

User plane gateway: A termination point of NG-U interface.

Overview of System

FIG. 1 illustrates an example of an overall structure of an NR system towhich a method proposed in the disclosure may be applied.

Referring to FIG. 1, an NG-RAN is configured with an NG-RA user plane(new AS sublayer/PDCP/RLC/MAC/PHY) and gNBs which provide a controlplane (RRC) protocol end for a user equipment (UE).

The gNBs are interconnected through an Xn interface.

The gNBs are also connected to an NGC through an NG interface.

More specifically the gNBs are connected to an access and mobilitymanagement function (AMF) through an N2 interface and to a user planefunction (UPF) through an N3 interface.

NR supports multiple numerologies (or subcarrier spacings (SCS)) forsupporting various 5G services. For example, if SCS is 15 kHz, NRsupports a wide area in typical cellular bands. If SCS is 30 kHz/60 kHz,NR supports a dense urban, lower latency and a wider carrier bandwidth.If SCS is 60 kHz or higher, NR supports a bandwidth greater than 24.25GHz in order to overcome phase noise.

An NR frequency band is defined as a frequency range of two types FR1and FR2. The FR1 and the FR2 may be configured as in Table 1 below.Furthermore, the FR2 may mean a millimeter wave (mmW).

TABLE 1 Frequency Corresponding Range frequency Subcarrier designationrange Spacing FR1 410 MHz-7125 MHz 15, 30, 60 kHz FR2 24250 MHz-52600MHz 60, 120, 240 kHz

Channel State Information (CSI) Related Procedure

In a new radio (NR) system, a channel state information-reference signal(CSI-RS) is used for time/frequency tracking, CSI computation, layer 1(L1)-reference signal received power (RSRP) computation, and mobility.

“A and/or B” used in the present disclosure may be interpreted as thesame meaning as that “A and/or B” includes at least one of A or B.”

The CSI computation is related to CSI acquisition, and the L1-RSRPcomputation is related to beam management (BM).

Channel state information (CSI generally refers to information which mayindicate the quality of a radio channel (or also called a link) formedbetween a UE and an antenna port.

An operation of a UE for a CSI-related procedure is described.

FIG. 2 is a flowchart illustrating an example of a CSI-relatedprocedure.

In order to perform one of uses of a CSI-RS described above, a terminal(e.g., user equipment (UE)) receives, from a base station (e.g., generalNode B or gNB), configuration information related to CSI through radioresource control (RRC) signaling (S110).

The configuration information related to the CSI may include at leastone of CSI-interference management (IM) resource-related information,CSI measurement configuration-related information, CSI resourceconfiguration-related information, CSI-RS resource-related information,or CSI report configuration-related information.

The CSI-IM resource-related information may include CSI-IM resourceinformation, CSI-IM resource set information, etc.

A CSI-IM resource set is identified by a CSI-IM resource set identifier(ID). One resource set includes at least one CSI-IM resource.

Each CSI-IM resource is identified by a CSI-IM resource ID.

The CSI resource configuration-related information defines a groupincluding at least one of a non zero power (NZP) CSI-RS resource set, aCSI-IM resource set, or a CSI-SSB resource set.

That is, the CSI resource configuration-related information includes aCSI-RS resource set list. The CSI-RS resource set list may include atleast one of an NZP CSI-RS resource set list, a CSI-IM resource setlist, or a CSI-SSB resource set list.

The CSI resource configuration-related information may be represented asa CSI-ResourceConfig IE.

The CSI-RS resource set is identified by a CSI-RS resource set ID. Oneresource set includes at least one CSI-RS resource.

Each CSI-RS resource is identified by a CSI-RS resource ID.

As in Table 2, parameters (e.g., a BM-related “repetition” parameter anda tracking-related “trs-Info” parameter) indicating the use of a CSI-RSfor each NZP CSI-RS resource set may be configured.

Table 2 illustrates an example of the NZP CSI-RS resource set IE.

TABLE 2 -- ASN1START -- TAG-NZP-CSI-RS-RESOURCESET-STARTNZP-CSI-RS-ResourceSet ::= SEQUENCE {   nzp-CSI-ResourceSetIdNZP-CSI-RS-ResourceSetId,   nzp-CSI-RS-Resources SEQUENCE     (SIZE (1 .. . maxNrofNZP-CSI-RS-ResourcesPerSet)) OF NZP-CSI-RS-ResourceId,  repetition   ENUMERATED { on, off } OPTIONAL,  aperiodicTriggeringOffset INTEGER(0 . . . 4)         OPTIONAL, -- NeedS   trs-Info ENUMERATED {true}            OPTIONAL, -- Need R   . . . }-- TAG-NZP-CSI-RS-RESOURCESET-STOP -- ASN1STOP

In Table 2, the repetition parameter is a parameter indicating whetherthe same beam is repeatedly transmitted, and indicates whether arepetition is “ON” or “OFF” for each NZP CSI-RS resource set. Atransmission (Tx) beam used in the present disclosure may be interpretedas the same meaning as a spatial domain transmission filter. A received(Rx) beam used in the present disclosure may be interpreted as the samemeaning as a spatial domain reception filter.

For example, if the repetition parameter in Table 2 is configured as“OFF”, a UE does not assume that an NZP CSI-RS resource(s) within aresource set is transmitted as the same Nrofports as the same DL spatialdomain transmission filter in all symbols.

Furthermore, the repetition parameter corresponding to a higher layerparameter corresponds to “CSI-RS-ResourceRep” of an L1 parameter.

The CSI report configuration-related information includes a reportconfiguration type (reportConfigType) parameter indicating a time domainbehavior and a report quantity (reportQuantity) parameter indicatingCSI-related quantity for reporting.

The time domain behavior may be periodic, aperiodic or semi-persistent.

Furthermore, the CSI report configuration-related information may berepresented as a CSI-ReportConfig IE. Table 3 below illustrates anexample of a CSI-ReportConfig IE.

TABLE 3 -- ASN1START -- TAG-CSI-RESOURCECONFIG-START CSI-ReportConfig::= SEQUENCE {   reportConfigId CSI- ReportConfigId,   carrier  ServCellIndex OPTIONAL, -- Need S   resourcesForChannelMeasurementCSI-ResourceConfigId,   csi-IM-ResourcesForInterferenceCSI-ResourceConfigId   OPTIONAL,  -- Need R  nzp-CSI-RS-ResourcesForInterference CSI-ResourceConfigId  OPTIONAL,  -- Need R   reportConfigType CHOICE {    periodic  SEQUENCE {     reportSlotConfig   CSI-ReportPeriodicityAndOffset,    pucch-CSI-ResourceList   SEQUENCE (SIZE (1 . . . maxNrofBWPs)) OFPUCCH-CSI-Resource    },    semiPersistentOnPUCCH   SEQUENCE {    reportSlotConfig   CSI-ReportPeriodicityAndOffset,    pucch-CSI-ResourceList   SEQUENCE (SIZE (1 . . . maxNrofBWPs)) OFPUCCH-CSI-Resource    },    semiPersistentOnPUSCH   SEQUENCE {    reportSlotConfig   ENUMERATED {sl5, sl10, sl20, sl40, sl80, sl160,sl320},     reportSlotOffsetList SEQUENCE (SIZE (1 . . .maxNrofUL-Allocations)) OF INTEGER(0 . . . 32),     p0alpha  P0-PUSCH-AlphaSetId    },    aperiodic   SEQUENCE {    reportSlotOffsetList SEQUENCE (SIZE (1 . . . maxNrofUL-Allocations))OF INTEGER(0 . . . 32)    }   },   reportQuantity CHOICE {    none  NULL,    cri-RI-PMI-CQI NULL,    cri-RI-i1   NULL,    cri-RI-i1-CQI  SEQUENCE {     pdsch-BundleSizeForCSI ENUMERATED {n2, n4} OPTIONAL   },    cri-RI-CQI   NULL,    cri-RSRP   NULL,    ssb-Index-RSRP  NULL,    cri-RI-LI-PMI-CQI NULL    },

Furthermore, the UE measures CSI based on the configuration informationrelated to CSI (S220). The CSI measurement may include (1) a CSI-RSreception process S221 of the UE and (2) a process S222 of computing CSIthrough a received CSI-RS.

A sequence for a CSI-RS is generated by Equation 1 below. Aninitialization value of a pseudo-random sequence C(i) is defined byEquation 2.

$\begin{matrix}{{r(m)} = {{\frac{1}{\sqrt{2}}( {1 - {2 \cdot {c( {2m} )}}} )} + {j\frac{1}{\sqrt{2}}( {1 - {2 \cdot {c( {{2m} + 1} )}}} )}}} & {〚{{Equation}\mspace{14mu} 1}〛} \\{c_{init} = {( {{2^{10}( {{N_{symb}^{slot}n_{s,f}^{\mu}} + l + 1} )( {{2n_{ID}} + 1} )} + n_{ID}} ){mod}\; 2^{31}}} & {〚{{Equation}\mspace{14mu} 2}〛}\end{matrix}$

In Equations 1 and 2, n_(s,l) ^(μ) indicates a slot number within aradio frame, and a pseudo-random sequence generator is initialized asCint at the start of each OFDM symbol, that is, n_(s,l) ^(μ).

Furthermore, 1 is an OFDM symbol number within a slot. n^(ID) isidentical with a higher-layer parameter scramblingID.

Furthermore, in the CSI-RS, resource element (RE) mapping of a CSI-RSresource is configured in time and frequency domains by a higher layerparameter CSI-RS-ResourceMapping.

Table 4 illustrates an example of a CSI-RS-ResourceMapping IE.

TABLE 4 -- ASN1START -- TAG-CSI-RS-RESOURCEMAPPING-STARTCSI-RS-ResourceMapping ::= SEQUENCE {   frequencyDomainAllocation CHOICE{    row1 BIT STRING (SIZE (4)),    row2 BIT STRING (SIZE (12)),    row4BIT STRING (SIZE (3)),    other BIT STRING (SIZE (6))   },   nrofPorts  ENUMERATED {p1,p2,p4,p8,p12,p16,p24,p32},  firstOFDMSymbolInTimeDomain INTEGER (0 . . . 13),  firstOFDMSymbolInTimeDomain2 INTEGER (2 . . . 12)     OPTIONAL,  --Need R   cdm-Type   ENUMERATED {noCDM, fd-CDM2, cdm4-FD2-TD2,cdm8-FD2-TD4},   density CHOICE {    dot5   ENUMERATED {evenPRBs,oddPRBs},    one   NULL,    three NULL,    spare NULL   },   freqBandCSI- FrequencyOccupation,   . . . }

In Table 4, density D indicates the density of CSI-RS resources measuredin an RE/port/physical resource block (PRB). nrofPorts indicates thenumber of antenna ports. Furthermore, the UE reports the measured CSI tothe base station (S230).

In this case, if the quantity of CSI-ReportConfig is configured as “none(or No report)” in Table 3, the UE may omit the report.

However, although the quantity is configured as “none (or No report)”,the UE may report the measured CSI to the base station.

A case where the quantity is configured as “none” is a case where anaperiodic TRS is triggered or a case where a repetition is configured.

In this case, the reporting of the UE may be defined to be omitted onlywhen the repetition is configured as “ON.”

In summary, if the repetition is configured as “ON” and “OFF”, CSIreporting may include all of “No report”, “SSB resource indicator(SSBRI) and L1-RSRP”, and “CSI-RS resource indicator (CRI) and L1-RSRP.”

Alternatively, if the repetition is “OFF”, the CSI reporting of “SSBRIand L1-RSRP” or “CRI and L1-RSRP” may be defined to be transmitted. Ifthe repetition is “ON”, the CSI reporting of “No report”, “SSBRI andL1-RSRP”, or “CRI and L1-RSRP” may be defined to be transmitted.

Beam Management (BM) Procedure

A beam management (BM) procedure defined in new radio (NR) is described.

The BM procedure corresponds to layer 1 (L1)/L2 (layer 2) procedures forobtaining and maintaining a set of base station (e.g., gNB or TRP)and/or a terminal (e.g., UE) beams which may be used for downlink (DL)and uplink (UL) transmission/reception, and may include the followingprocedure and terms.

-   -   Beam measurement: an operation of measuring characteristics of a        beamforming signal received by a base station or a UE.    -   Beam determination: an operation of selecting, by a base station        or a UE, its own transmission (Tx) beam/received (Rx) beam.    -   Beam sweeping: an operation of covering a space region by using        a Tx and/or Rx beam for a given time interval in a predetermined        manner.    -   Beam report: an operation of reporting, by a UE, information of        a beamformed signal based on beam measurement.

FIG. 3 is a concept view illustrating an example of a beam-relatedmeasurement model.

For beam measurement, an SS block (or SS/PBCH block (SSB)) or a channelstate information reference signal (CSI-RS) is used in the downlink. Asounding reference signal (SRS) is used in the uplink.

In RRC_CONNECTED, a UE measures multiple beams (or at least one beam) ofa cell. The UE may average measurement results (RSRP, RSRQ, SINR, etc.)in order to derive cell quality.

Accordingly, the UE may be configured to consider a sub-set of adetected beam(s).

Beam measurement-related filtering occurs in different two levels (in aphysical layer that derives beam quality and an RRC level in which cellquality is derived from multiple beams).

Cell quality from beam measurement is derived in the same manner withrespect to a serving cell(s) and a non-serving cell)(s).

If a UE is configured by a gNB to report measurement results for aspecific beam(s), a measurement report includes measurement results forX best beams. The beam measurement results may be reported asL1-reference signal received power (RSRP).

In FIG. 3, K beams (gNB beam 1, gNB beam 2, . . . , gNB beam k) 210 areconfigured for L3 mobility by a gNB, and correspond to the measurementof a synchronization signal (SS) block (SSB) or CSI-RS resource detectedby a UE in the L1.

In FIG. 3, layer 1 filtering 220 means internal layer 1 filtering of aninput measured at a point A.

Furthermore, in beam consolidation/selection 230, beam-specificmeasurements are integrated (or merged) in order to derive cell quality.

Layer 3 filtering 240 for cell quality means filtering performed onmeasurement provided at a point B.

A UE evaluates a reporting criterion whenever new measurement resultsare reported at least at points C and C1.

D corresponds to measurement report information (message) transmitted ata radio interface.

In L3 beam filtering 250, filtering is performed on measurement(beam-specific measurement) provided at a point A1.

In beam selection 260 for a beam report, X measurement values areselected in measurement provided at a point E.

F indicates beam measurement information included in a measurementreport (transmission) in a radio interface.

Furthermore, the BM procedure may be divided into (1) a DL BM procedureusing a synchronization signal (SS)/physical broadcast channel (PBCH)Block or CSI-RS and (2) an UL BM procedure using a sounding referencesignal (SRS).

Furthermore, each of the BM procedures may include Tx beam sweeping fordetermining a Tx beam and Rx beam sweeping for determining an Rx beam.

DL BM Procedure

First, the DL BM procedure is described.

The DL BM procedure may include (1) the transmission of beamformed DLreference signals (RSs) (e.g., CSI-RS or SS block (SSB)) of a basestation and (2) beam reporting of a UE.

In this case, the beam reporting may include a preferred DL RSidentifier (ID)(s) and L1-reference signal received power (RSRP)corresponding thereto.

The DL RS ID may be an SSB resource indicator (SSBRI) or a CSI-RSresource indicator (CRI).

FIG. 4 is a diagram illustrating an example of a DL BM procedure-relatedTx beam.

As illustrated in FIG. 4, an SSB beam and a CSI-RS beam may be used forbeam measurement.

In this case, a measurement metric is L1-RSRP for each resource/block.

An SSB may be used for coarse beam measurement, and a CSI-RS may be usedfor fine beam measurement.

Furthermore, the SSB may be used for both Tx beam sweeping and Rx beamsweeping.

A UE may perform the Rx beam sweeping using an SSB while changing an Rxbeam with respect to the same SSBRI across multiple SSB bursts.

In this case, one SS burst includes one or more SSBs, and one SS burstset includes one or more SSB bursts.

DL BM Procedure Using SSB

FIG. 5 is a flowchart illustrating an example of a DL BM procedure usingan SSB.

A configuration for a beam report using an SSB is performed uponCSI/beam configuration in an RRC connected state (or RRC connectedmode).

As in a CSI-ResourceConfig IE of Table 8, a BM configuration using anSSB is not separately defined, and an SSB is configured like a CSI-RSresource.

Table 5 illustrates an example of the CSI-ResourceConfig IE.

TABLE 5 -- ASN1START -- TAG-CSI-RESOURCECONFIG-START CSI-ResourceConfig::= SEQUENCE {   csi-ResourceConfigId CSI-ResourceConfigId,  csi-RS-ResourceSetList CHOICE {    nzp-CSI-RS-SSB   SEQUENCE {           nzp-CSI-RS-ResourceSetList SEQUENCE (SIZE  (1 . . .maxNrofNZP-CSI-RS-ResourceSetsPerConfig)) OF NZP-CSI-RS- ResourceSetIdOPTIONAL,            csi-SSB-ResourceSetList   SEQUENCE (SIZE (1 . . .maxNrofCSI-SSB-ResourceSetsPerConfig)) OF CSI-SSB-ResourceSetId OPTIONAL    },    csi-IM-ResourceSetList SEQUENCE  (SIZE(1 . . . maxNrofCSI-IM-ResourceSetsPerConfig)) OF CSI-IM-ResourceSetId  },   bwp-Id BWP-Id,   resourceType ENUMERATED { aperiodic,semiPersistent, periodic },   . . . } --TAG-CSI-RESOURCECONFIGTOADDMOD-STOP -- ASN1STOP

In Table 5, the csi-SSB-ResourceSetList parameter indicates a list ofSSB resources used for beam management and reporting in one resourceset. A UE receives, from a base station, a CSI-ResourceConfig IEincluding CSI-SSB-ResourceSetList including SSB resources used for BM(S510).

In this case, the SSB resource set may be configured with {SSBx1, SSBx2,SSBx3, SSBx4, . . . }.

An SSB index may be defined from 0 to 63.

Furthermore, the UE receives an SSB resource from the base station basedon the CSI-SSB-ResourceSetList (S520).

Furthermore, if CSI-RS reportConfig related to a report for an SSBRI andL1-RSRP has been configured, the UE (beam) reports, to the base station,the best SSBRI and L1-RSRP corresponding thereto (S530).

That is, if reportQuantity of the CSI-RS reportConfig IE is configuredas “ssb-Index-RSRP”, the UE reports the best SSBRI and the L1-RSRPcorresponding thereto to the base station.

Furthermore, if a CSI-RS resource is configured in an OFDM symbol(s)identical with an SS/PBCH block (SSB) and “QCL-TypeD” is applicable, theUE may assume that a CSI-RS and an SSB are quasi co-located from a“QCL-TypeD” viewpoint.

In this case, the QCL TypeD may mean that antenna ports have been QCLedfrom a spatial Rx parameter viewpoint. When the UE receives a pluralityof DL antenna ports having a QCL Type D relation, the same Rx beam maybe applied.

Furthermore, the UE does not expect that a CSI-RS will be configured inan RE that overlaps an RE of an SSB.

DL BM Procedure Using CSI-RS

If a UE is configured with NZP-CSI-RS-ResourceSet having a (higher layerparameter) repetition configured as “ON”, the UE may assume that atleast one CSI-RS resource within the NZP-CSI-RS-ResourceSet istransmitted as the same downlink spatial domain transmission filter.

That is, at least one CSI-RS resource within the NZP-CSI-RS-ResourceSetis transmitted through the same Tx beam.

In this case, the at least one CSI-RS resource within theNZP-CSI-RS-ResourceSet may be transmitted in different OFDM symbols ormay be transmitted in different frequency domains (i.e., through FDM).

A case where the at least one CSI-RS resource is FDMed is a case where aUE is a multi-panel UE.

Furthermore, a case where a repetition is configured as “ON” is relatedto an Rx beam sweeping procedure of a UE.

The UE does not expect that different periodicities will be received inperiodicityAndOffset in all CSI-RS resources withinNZP-CSI-RS-Resourceset.

Furthermore, if the repetition is configured as “OFF”, the UE does notassume that at least one CSI-RS resource within NZP-CSI-RS-ResourceSetis transmitted as the same downlink spatial domain transmission filter.

That is, the at least one CSI-RS resource within NZP-CSI-RS-ResourceSetis transmitted through different Tx beams.

A case where the repetition is configured as “OFF” is related to a Txbeam sweeping procedure of a base station.

Furthermore, the repetition parameter may be configured only withrespect to CSI-RS resource sets associated with CSI-ReportConfig havingthe reporting of L1 RSRP or “No Report (or None).”

If a UE is configured with CSI-ReportConfig having reportQuantityconfigured as “cri-RSRP” or “none” and CSI-ResourceConfig (higher layerparameter resourcesForChannelMeasurement) for channel measurement doesnot include a higher layer parameter “trs-Info” and includesNZP-CSI-RS-ResourceSet configured (repetition=ON) as a higher layerparameter “repetition”, the UE may be configured with only the samenumber of ports (1-port or 2-port) having a higher layer parameter“nrofPorts” with respect to all CSI-RS resources within theNZP-CSI-RS-ResourceSet.

More specifically, CSI-RS uses are described. If a repetition parameteris configured in a specific CSI-RS resource set and TRS_info is notconfigured, a CSI-RS is used for beam management.

Furthermore, if a repetition parameter is not configured and TRS_info isconfigured, a CSI-RS is used for a tracking reference signal (TRS).

Furthermore, if a repetition parameter is not configured and TRS_info isnot configured, a CSI-RS is used for CSI acquisition.

FIG. 6 is a diagram illustrating an example of a DL BM procedure using aCSI-RS.

(a) of FIG. 6 illustrates an Rx beam determination (or refinement)procedure of a UE. (b) of FIG. 6 indicates a Tx beam determinationprocedure of a base station.

Furthermore, (a) of FIG. 6 corresponds to a case where the repetitionparameter is configured as “ON”, and (b) of FIG. 6 corresponds to a casewhere the repetition parameter is configured as “OFF.”

An Rx beam determination process of a UE is described with reference to(a) of FIG. 6 and FIG. 7.

FIG. 7 is a flowchart illustrating an example of a received beamdetermination process of a UE.

The UE receives, from a base station, an NZP CSI-RS resource set IEincluding a higher layer parameter repetition through RRC signaling(S710).

In this case, the repetition parameter is configured as “ON.”

Furthermore, the UE repeatedly receives a resource(s) within a CSI-RSresource set configured as a repetition “ON” in different OFDM symbolsthrough the same Tx beam (or DL spatial domain transmission filter) ofthe base station (S720).

Accordingly, the UE determines its own Rx beam (S730).

In this case, the UE omits a CSI report or transmits, to the basestation, a CSI report including a CRI/L1-RSRP (S740).

In this case, reportQuantity of the CSI report config may be configuredas “No report (or None)” or “CRT+L1-RSRP.”

That is, if a repetition “ON” is configured, the UE may omit a CSIreport. Alternatively, the UE may report ID information (CRT) for a beampair-related preference beam and a corresponding quality value(L1-RSRP).

A Tx beam determination process of a base station is described withreference to (b) of FIG. 6 and FIG. 8.

FIG. 8 is a flowchart illustrating an example of a method ofdetermining, by a base station, a transmission beam.

A UE receives, from a base station, an NZP CSI-RS resource set IEincluding a higher layer parameter repetition through RRC signaling(S810).

In this case, the repetition parameter is configured as “OFF”, and isrelated to a Tx beam sweeping procedure of the base station.

Furthermore, the UE receives resources within the CSI-RS resource setconfigured as the repetition “OFF” through different Tx beams (DLspatial domain transmission filters) of the base station (S820).

Furthermore, the UE selects (or determines) the best beam (S830), andreports an ID for the selected beam and related quality information(e.g., L1-RSRP) to the base station (S840).

In this case, reportQuantity of the CSI report config may be configuredas “CRT+L1-RSRP.”

That is, the UE reports a CRT and corresponding L1-RSRP to the basestation if a CSI-RS is transmitted for BM.

FIG. 9 is a diagram illustrating an example of resource allocation intime and frequency domains related to the operation of FIG. 6.

That is, it may be seen that if the repetition “ON” has been configuredin a CSI-RS resource set, a plurality of CSI-RS resources is repeatedlyused by applying the same Tx beam, and if a repetition “OFF” has beenconfigured in the CSI-RS resource set, different CSI-RS resources aretransmitted through different Tx beams.

DL BM-Related Beam Indication

A UE may be RRC-configured with a list of a maximum of M candidatetransmission configuration indication (TCI) states for an object of atleast quasi co-location (QCL) indication. In this case, M may be 64.

Each of the TCI states may be configured as one RS set.

Each ID of a DL RS for at least a spatial QCL purpose (QCL Type D)within the RS set may refer to one of DL RS types, such as an SSB, aP-CSI RS, an SP-CSI RS, and an A-CSI RS.

The initialization/update of an ID of a DL RS(s) within the RS set usedfor the at least spatial QCL purpose may be performed through at leastexplicit signaling.

Table 6 illustrates an example of a TCI-State IE.

The TCI-State IE associates one or two DL reference signals (RS) with acorresponding quasi co-location (QCL) type.

TABLE 6 -- ASN1START -- TAG-TCI-STATE-START TCI-State ::= SEQUENCE {  tci-StateId TCI-StateId,   qcl-Type1 QCL-Info,   qcl-Type2 QCL-Info           OPTIONAL, -- Need R   . . . } QCL-Info ::= SEQUENCE {   cellServCellIndex         OPTIONAL, -- Need R   bwp-Id BWP-Id           OPTIONAL, -- Cond CSI-RS-Indicated   referenceSignal CHOICE {    csi-rs NZP- CSI-RS-ResourceId,     ssb   SSB-Index   },   qcl-Type  ENUMERATED {typeA, typeB, typeC, typeD},   . . . } --TAG-TCI-STATE-STOP -- ASN1STOP

In Table 6, the bwp-Id parameter indicates a DL BWP where an RS islocated. The cell parameter indicates a carrier where an RS is located.The reference signal parameter indicates a reference antenna port(s)that becomes the source of a quasi co-location for a correspondingtarget antenna port(s) or a reference signal including the referenceantenna port(s). A target antenna port(s) may be a CSI-RS, a PDCCH DMRS,or a PDSCH DMRS. For example, in order to indicate QCL reference RSinformation for an NZP CSI-RS, a corresponding TCI state ID may beindicated in NZP CSI-RS resource configuration information. Furthermore,for example, in order to indicate QCL reference information for a PDCCHDMRS antenna port(s), a TCI state ID may be indicated in a CORESETconfiguration. Furthermore, for example, in order to indicate QCLreference information for a PDSCH DMRS antenna port(s), a TCI state IDmay be indicated through DCI.

Quasi-Co Location (QCL)

An antenna port is defined so that a channel on which a symbol on anantenna port is carried is inferred from a channel on which anothersymbol on the same antenna port is carried. If the properties of achannel on which a symbol on one antenna port is carried can be derivedfrom a channel on which a symbol on another antenna port is carried, thetwo antenna ports may be said to have a quasi co-located or quasico-location (QC/QCL) relation.

In this case, the properties of the channel includes one or more ofdelay spread, Doppler spread, a frequency shift, average received power,received timing, and a spatial RX parameter. In this case, the spatialRx parameter means a spatial (reception) channel property parameter,such as an angle of arrival.

In order to decode a PDSCH according to a detected PDCCH having intendedDCI with respect to a corresponding UE and a given serving cell, a UEmay be configured with a list of up to M TCI-State configurations withinhigher layer parameter PDSCH-Config. The M depends on a UE capability.

Each of the TCI-States includes a parameter for configuring a quasico-location relation between one or two DL reference signals and theDM-RS port of a PDSCH.

The quasi co-location relation is configured as a higher layer parameterqcl-Type1 for a first DL RS and a higher layer parameter qcl-Type2 (ifconfigured) for a second DL RS.

In the case of the two DL RSs, QCL types are not the same regardless ofwhether reference is the same DL RS or different DL RSs.

A quasi co-location type corresponding to each DL RS is given by ahigher layer parameter qcl-Type of QCL-Info, and may take one of thefollowing values:

-   -   “QCL-TypeA”: {Doppler shift, Doppler spread, average delay,        delay spread}    -   “QCL-TypeB”: {Doppler shift, Doppler spread}    -   “QCL-TypeC”: {Doppler shift, average delay}    -   “QCL-TypeD”: {Spatial Rx parameter}

For example, if a target antenna port is a specific NZP CSI-RS, it maybe indicated/configured that corresponding NZP CSI-RS antenna ports havebeen QCLed with a specific TRS from a QCL-Type A viewpoint and with aspecific SSB from a QCL-Type D viewpoint. A UE configured with such anindication/configuration may receive a corresponding NZP CSI-RS by usingDoppler, delay value measured in a QCL-TypeA TRS, and may apply, to thereception of the corresponding NZP CSI-RS, an Rx beam used for thereception of a QCL-TypeD SSB.

The UE receives an activation command used to map up to eight TCI statesto the codepoint of a DCI field “Transmission Configuration Indication.”

Beam Failure Detection (BFD) and Beam Failure Recovery (BFR) Procedure

A beam failure detection and beam failure recovery procedure isdescribed below.

In a beamformed system, a radio link failure (RLF) may frequently occurdue to the rotation, movement or beam blockage of a UE.

Accordingly, in order to prevent a frequent RLF from occurring, BFR issupported in NR.

BFR is similar to a radio link failure recovery procedure, and may besupported if a UE is aware of a new candidate beam(s).

For convenience of understanding, (1) a radio link monitoring procedureand (2) a link recovery procedure are first described in brief.

Radio Link Monitoring

Downlink radio link quality of a primary cell is monitored by a UE forthe purpose of indicating an out-of-sync or in-sync state for higherlayers.

A cell used in the present disclosure may also be represented as acomponent carrier, a carrier, a BW, etc.

A UE does not need to monitor downlink radio link quality in a DL BWPother than an active DL BWP on a primary cell.

The UE may be configured with respect to each DL BWP of SpCell having aset of resource indices through a corresponding set of (higher layerparameter) RadioLinkMonitoringRS for radio link monitoring by a higherlayer parameter failureDetectionResources.

A higher layer parameter RadioLinkMonitoringRS having a CSI-RS resourceconfiguration index (csi-RS-Index) or an SS/PBCH block index (ssb-Index)is provided to the UE.

If RadioLinkMonitoringRS is not provided to a UE and the UE is providedwith a TCI-state for a PDCCH including one or more RSs including one ormore of a CSI-RS and/or an SS/PBCH block,

-   -   if an active TCI-state for the PDCCH includes only one RS, the        UE uses, for radio link monitoring, an RS provided for the        active TCI-state for the PDCCH.    -   If the active TCI-state for the PDCCH includes two RSs, the UE        expects that one RS has QCL-TypeD and will use one RS for radio        link monitoring. In this case, the UE does not expect that both        the RSs will have QCL-TypeD.    -   The UE does not use an aperiodic RS for radio link monitoring.

Table 7 below illustrates an example of an RadioLinkMonitoringConfig IE.

The RadioLinkMonitoringConfig IE is used to configure radio linkmonitoring for the detection of a beam failure and/or a cell radio linkfailure.

TABLE 7 -- ASN1START -- TAG-RADIOLINKMONITORINGCONFIG-STARTRadioLinkMonitoringConfig ::= SEQUENCE {  failureDetectionResourcesToAddModList SEQUENCE (SIZE(1 . . .maxNrofFailureDetectionResources))  OF   RadioLinkMonitoringRS  OPTIONAL,  -- Need N   failureDetectionResourcesToReleaseList SEQUENCE(SIZE(1 . . .maxNrofFailureDetectionResources))  OF  RadioLinkMonitoringRS-Id  OPTIONAL,-- Need N   beamFailureInstanceMaxCount ENUMERATED  {n1, n2,n3, n4, n5, n6, n8, n10}   OPTIONAL,  -- Need S  beamFailureDetectionTimer ENUMERATED {pbfd1, pbfd2, pbfd3, pbfd4,pbfd5, pbfd6, pbfd8, pbfd10}   OPTIONAL,  -- Need R   . . . }RadioLinkMonitoringRS ::= SEQUENCE {   radioLinkMonitoringRS-Id  RadioLinkMonitoringRS-Id,   purpose   ENUMERATED {beamFailure, rlf,both},   detectionResource CHOICE {     ssb-Index SSB- Index,    csi-RS-Index NZP-CSI-RS- ResourceId   },   . . . } --TAG-RADIOLINKMONITORINGCONFIG-STOP -- ASN1STOP

In Table 7, the beamFailureDetectionTimer parameter is a timer for beamfailure detection. The beamFailureInstanceMaxCount parameter indicatesthat a UE triggers beam failure recovery after how many beam failureevents.

The value n1 corresponds to one beam failure instance, and the value n2corresponds to two beam failure instances. If a network reconfigures acorresponding field, a UE resets a counter related toon-goingbeamFailureDetectionTimer and beamFailureInstanceMaxCount.

If a corresponding field is not present, the UE does not trigger beamfailure recovery.

Table 8 illustrates an example of an BeamFailureRecoveryConfig IE.

The BeamFailureRecoveryConfig IE is used to configure, in a UE, RACHresources and candidate beams for beam failure recovery in a beamfailure detection situation.

TABLE 8 -- ASN1START -- TAG-BEAM-FAILURE-RECOVERY-CONFIG-STARTBeamFailureRecoveryConfig ::= SEQUENCE {   rootSequenceIndex-BFR INTEGER(0 . . . 137)     OPTIONAL,  -- Need M   rach-ConfigBFR RACH-ConfigGeneric                OPTIONAL, -- Need M   rsrp-ThresholdSSBRSRP-Range        OPTIONAL,  -- Need M   candidateBeamRSList SEQUENCE(SIZE(1 . . . maxNrofCandidateBeams)) OF PRACH-ResourceDedicatedBFR  OPTIONAL,  -- Need M   ssb-perRACH-Occasion ENUMERATED  {oneEighth,oneFourth, oneHalf, one, two, four, eight, sixteen} OPTIONAL,  -- Need M  ra-ssb-OccasionMaskIndex INTEGER (0 . . . 15)        OPTIONAL,  --Need M   recoverySearchSpaceId SearchSpaceId     OPTIONAL,  -- CondCF-BFR   ra-Prioritization RA-Prioritization     OPTIONAL,  -- Need R  beamFailureRecoveryTimer ENUMERATED {ms10, ms20, ms40, ms60, ms80,ms100, ms150, ms200} OPTIONAL, -- Need M   . . . }PRACH-ResourceDedicatedBFR ::= CHOICE {   ssb BFR- SSB-Resource,  csi-RS BFR-CSIRS- Resource } BFR-SSB-Resource ::= SEQUENCE {   ssbSSB-Index,   ra-PreambleIndex INTEGER (0 . . . 63),   . . . }BFR-CSIRS-Resource ::= SEQUENCE {   csi-RS NZP-CSI-RS- ResourceId,  ra-OccasionList SEQUENCE (SIZE(1 . . . maxRA- OccasionsPerCSIRS)) OFINTEGER (0 . . . maxRA-Occasions-1) OPTIONAL,  -- Need R  ra-PreambleIndex INTEGER (0 . . . 63)        OPTIONAL,  -- Need R   .. . } -- TAG-BEAM-FAILURE-RECOVERY-CONFIG-STOP -- ASN1STOP

In Table 8, the beamFailureRecoveryTimer parameter is a parameterindicating a timer for beam failure recovery, and a value thereof may beset as ms. The candidateBeamRSList parameter indicates a list ofreference signals (CSI-RSs and/or SSBs) for identifying random access(RA) parameters associated with candidate beams for recovery.

The RecoverySearchSpaceld parameter indicates a search space used for aBFR random access response (RAR).

When radio link quality is poorer than a threshold value Qout for allresources within a set of resources for radio link monitoring, thephysical layer of a UE indicates out-of-sync through a higher layer inframes in which radio link quality is evaluated.

When radio link quality for a given resource within a resource set forradio link monitoring is better than a threshold value Qin, the physicallayer of the UE indicates in-sync through a higher layer in a frame inwhich radio link quality is evaluated.

Link Recovery Procedure

With respect to a serving cell, a UE is provided with a q0 set ofperiodic CSI-RS resource configuration indices by a higher layerparameter failureDetectionResources and a q1 set of periodic CSI-RSresource configuration indices and/or SS/PBCH block indices bycandidateBeamRSList for radio link quality measurement on a servingcell.

If a UE is not provided with failureDetectionResources, the UEdetermines the q0 set to include an SS/PBCH block index and a periodicCSI-RS resource configuration index having the same value as an RS indexwithin an RS set indicated by a TCI state for each control resource setused for its own PDCCH monitoring.

A threshold value Qout LR corresponds to a default value of a higherlayer parameter rlmInSyncOutOfSyncThreshold and a value provided by ahigher layer parameter rsrp-ThresholdSSB.

The physical layer of the UE evaluates radio link quality based on theq0 set of a resource configuration for the threshold Qout LR.

With respect to the set q0, the UE evaluates radio link quality based ononly periodic CSI-RS resource configuration and SSBs quasi co-locatedwith the DMRS reception of a PDCCH, which is monitored by the UE.

The UE applies a Qin_LR threshold value to an L1-RSRP measurement valueobtained from an SS/PBCH block.

After scaling each CSI-RS received power into a value provided bypowerControlOffsetSS, the UE applies the Qin_LR threshold value to theL1-RSRP measurement value obtained with respect to the CSI-RS resource.

The physical layer of the UE provides indication to a higher layer whenradio link quality of all corresponding resource configurations within aset used for the UE to evaluate the radio link quality is poorer thanthe threshold value Qout LR.

The physical layer provides notification to a higher layer when theradio link quality is poorer than the threshold Qout LR havingperiodicity determined as a maximum value between the shortestperiodicity of an SS/PBCH block and 2 msec in a periodic CSI-RSconfiguration or in the q0 set used for the UE to evaluate the radiolink quality.

In response to a request from a higher layer, the UE provides the higherlayer with a periodic CSI-RS configuration index and/or SS/PBCH blockindex from the q1 set and a corresponding L1-RSRP measurement valueequal to or identical with a corresponding threshold value.

A UE may be provided with a control resource set through a link with asearch space set provided by recoverySearchSpaceId in order to monitor aPDCCH in the control resource set.

If the UE is provided with recoverySearchSpaceId, the UE does not expectthat another search space will be provided in order to monitor a PDCCHin a control resource set associated with a search space provided byrecoverySearchSpaceId.

The aforementioned beam failure detection (BFD) and beam failurerecovery (BFR) procedure is subsequently described.

When a beam failure is detected on a serving SSB or a CSI-RS(s), a beamfailure recovery procedure used to indicate a new SSB or CSI-RS for aserving base station may be configured by RRC.

RRC configures BeamFailureRecoveryConfig for a beam failure detectionand recovery procedure.

FIG. 10 is a flowchart illustrating an example of a beam failurerecovery procedure.

The BFR procedure may include (1) a beam failure detection step S1010,(2) a new beam identification step S1020, (3) a beam failure recoveryrequest (BFRQ) step S1030 and (4) the step S1040 of monitoring aresponse to BFRQ from a base station.

In this case, a PRACH preamble or a PUCCH may be used for the step (3),that is, for BFRQ transmission.

The step (1), that is, the beam failure detection, is more specificallyis described.

When the block error rates (BLERs) of all serving beams are a thresholdor more, this is called a beam failure instance.

RSs(qo) to be monitored by a UE is explicitly configured by RRC or isimplicitly determined by a beam RS for a control channel.

The indication of a beam failure instance is periodic through a higherlayer, and an indication interval is determined by the lowestperiodicity of beam failure detection (BFD) RSs.

If evaluation is lower than a beam failure instance BLER threshold, anindication through a higher layer is not performed.

If N consecutive beam failure instances occur, a beam failure isdeclared.

In this case, N is a NrofBeamFailurelnstance parameter configured byRRC.

1-port CSI-RS and SSB is supported for a BFD RS set.

Next, the step (2), that is, new beam indication is described.

A network NW may configure one or multiple PRACH resources/sequences fora UE.

A PRACH sequence is mapped to at least one new candidate beam.

The UE selects a new beam among candidate beams each having L1-RSRP setto be equal to or higher than a threshold set by RRC, and transmits aPRACH through the selected beam. In this case, which beam is selected bythe UE may be a UE implementation issue.

Next, the steps (3) and (4), that is, BFRQ transmission and themonitoring of a response to BFRQ are is described.

A UE may be configured with a dedicated CORESET by RRC in order tomonitor time duration of a window and a response to BFRQ from a basestation.

The UE starts monitoring after 4 slots of PRACH transmission.

The UE assumes that the dedicated CORESET has been spatially QCLed withthe DL RS of a UE-identified candidate beam in a beam failure recoveryrequest.

If a timer expires or the number of PRACH transmissions reaches amaximum number, the UE stops the BFR procedure.

In this case, a maximum number and timer of PRACH transmissions isconfigured by RRC.

Slot Aggregation in NR

In Rel-15 new ratio (NR), a method of increasing reliability byrepetitively transmitting one transport block (TB) to one layer in aplurality of contiguous slots has been standardized as described in apredefined rule (e.g., 3GPP TS 38.214, 5.1.2.1., 6.1.2.1.) with respectto the transmission of a physical downlink shared channel (PDSCH) and aphysical uplink shared channel (PUSCH), that is, physical channelscapable of transmitting data and control information. In this case, eachof aggregationFactorDL and aggregationFactorUL may have one value of{2,4,8} (refer to 3GPP TS 38.331). That is, the same data may berepeatedly transmitted in contiguous 2 slots, 4 slots, or 8 slots.

If a UE is configured with aggregationFactorDL>1, the same symbolallocation may also be applied to aggregationFactorDL contiguous slots.The UE may expect that a TB is repeated within each symbol allocationwithin the AggregationFactorDL contiguous slots and a PDSCH will belimited to a single transmission layer. A redundancy version to beapplied to an n-th transmission occasion of the TB may be determinedaccording to Table 9.

Table 9 illustrates a redundancy version applied whenaggregationFactorDL>1.

TABLE 9 ry_(id) indicated by DCI that rv_(id) applied to an n^(th)transmission occasion schedules n mod n mod n mod n mod a PDSCH 4 = 0 4= 1 4 = 2 4 = 3 0 0 2 3 1 2 2 3 1 0 3 3 1 0 2 1 1 0 2 3

When the UE is configured with aggregationFactorUL>1, the same symbolallocation may be applied throughout aggregationFactorUL consecutiveslots, and the PUSCH may be limited to a single transmission layer. TheUE may have to repeat the TB throughout aggregationFactorUL consecutiveslots by applying the same symbol allocation in each slot. A redundancyversion to be applied to an nth transmission occasion of the TB may bedetermined according to Table 10.

Table 10 illustrates a redundancy version when aggregationFactorUL>1.

TABLE 10 ry_(id) indicated by DCI that rv_(id) applied to an n^(th)transmission occasion schedules n mod n mod n mod n mod a PUSCH 4 = 0 4= 1 4 = 2 4 = 3 0 0 2 3 1 2 2 3 1 0 3 3 1 0 2 1 1 0 2 3

Furthermore, in NR, the same uplink control information (UCI) may berepeatedly transmitted in a plurality of contiguous slots (in whichavailable UL resource is present) with respect to a physical uplinkcontrol channel (PUCCH), that is, a channel in which uplink controlinformation is transmitted, as described in a predefined rule (e.g.,3GPP TS 38.213, 9.2.6.).

As described above, if a multi-slot PUSCH in which repetitivetransmissions for a TB are performed and/or a multi-slot PUCCH in whichrepetitive transmissions for UCI are performed is configured and/orindicated, when a collision occurs between a PUSCH and/or PUCCH resourceand another PUCCH resource and/or PUSCH resource (transmission isindicated in the same symbol and/or slot) during repetitivetransmissions in contiguous slots in which an available uplink (UL)resource is present, an operation of not transmitting the TB and/or theUCI in a corresponding slot or piggybacking (or multiplexing) andtransmitting the TB and/or the UCI in a resource in which a collisionhas occurred, etc. is defined.

Cell/Base Station Diversity Improvement

In a resource of ultra-reliable, low latency communications (URLLC)service, to secure reliability in relation to a radio channel state is achallenging issue. In general, a requirement for a radio section ofreliability are defined so that the probability that a packet of y bytesneeds to be transmitted within x msec is z % or more (e.g., x=1, y=100,z=99.999). In order to satisfy such a requirement, the most difficultpoint is that the capability of a corresponding channel does notfundamentally satisfy the condition because the quality of a radiochannel itself is too deteriorated.

In the present disclosure, a cell/base station diversity is obtained tosolve the above-described problem. That is, the same data is transmittedto multiple cells/base stations/RPs, and as a result, even though aradio channel for a specific cell/base station/RP significantlydeteriorates, the UE may send information to another cell/basestation/RP having a relatively excellent channel state to satisfy areliability requirement. Hereinafter, embodiments for obtaining thecell/base station diversity will be described in an order of cellcycling uplink transmission, cross cell scheduling, UE demodulation,downlink control signaling for indicating a sequence of the RPs, symbolmuting for cell cycling, and uplink synchronization.

Cell Cycling Uplink Transmission

In uplink transmission, the UE performs data transmission alternativelyto a plurality of cells/base stations/RPs in a promised order, that is,performs cell cycling uplink transmission. In the consecutivetransmission, uplink scheduling information (uplink grant) has a featureof being signaled to the UE only once.

When this technique is applied, various methods may be considered inconfiguring a signal to be transmitted for each cell/base station/RP.

As an example, a method for repeatedly transmitting the same signal toeach cell/base station/RP may be considered. That is, a method forrepeatedly transmitting a signal to which the same channel coding isapplied from the same information bit to each cell/base station/RP maybe considered.

As another example, a method may be considered, which performs coding ata lower coding ratio in proportion to the number of participatingcells/base stations/RPs from one information bit and then separatelytransmits coded bits to each cell/base station/RP.

When such methods are summarized, the methods may be classified intoextended channel coding and separated channel coding.

1) Extended Channel Coding

The extended channel coding is a technique that applies channel codingso as to transmit different parity bits of an encoded codeword todifferent cells/base stations/RPs and decode the transmitted parity bitsin one decoder. The extended channel coding may be classified as followsaccording to whether the information bit is repeated.

-   -   Information bit repetition channel coding: According to this        technique, the information bits in transport blocks (TBs) to be        transmitted to different cells/base stations/RPs are configured        to be the same as each other and the parity bits are configured        to be different from each other. A parity bit to be used in        encoding is designated in advance to prevent the parity bits of        different cells/base stations/RPs from being redundant. This is        similar to a case where the TB to be transmitted to each        cell/base station/RP is considered as retransmission of IR-HARQ.

As an example, when the number of cells/base stations/RPs is N, theparity bits generated in encoding may be divided into N groups and eachcell/base station/RP may be configured to use only the parity bit in thegroup. An apparatus that receives the corresponding signal may knowparity group information transmitted to each cell/base station/RP, andthe parity bits in the TB received in each cell/base station/RP may besorted for each group and decoded.

-   -   Information bit non-repetition channel coding: According to this        technique, TBs are bound to be form one group TB in different        cells/base stations/RPs, and the channel coding is performed        according to a group TB size. The corresponding technique has an        advantage that a channel coding gain is the largest and a        disadvantage that decoding is possible only when all TBs of each        cell/base station/RP should be received.

2) Separated Channel Coding

The separated channel coding technique may be classified into a loglikelihood ratio (LLR) combining technique and a hard value combiningtechnique.

-   -   Repetition based LLR combining: According to this technique, TBs        having the same size are repeatedly transmitted to different        cells/base stations/RPs. An apparatus that receives the        corresponding signal obtains an LLR value by independently        performing a process before decoding. Thereafter, the apparatus        may add calculated LLR values and utilize the added LLR values        as an input value of one decoder.    -   Hard value combining: According to this technique, the TBs        having the same size are applied to different cells/base        stations/RPs and the same TB is repeatedly transmitted, and TBs        received by different cells/base stations/RPs are independently        decoded. When even one of the TBs of each cell/base station/RP        is successfully decoded, it is determined that reception of a        signal is successful.

Cross Cell Scheduling

The network schedules scheduling information for a plurality ofconsecutive subframes in a first subframe only once, and the UEtransmits the information to the plurality of cells/base stations/RPs inuplink transmission in the plurality of consecutive subframes.

Information regarding whether uplink scheduling for the plurality ofconsecutive subframes is performed may be provided to the UE through ahigher layer signaling such as an MAC layer message or an RRC layermessage or transferred to the UE together with the uplink schedulinginformation.

According to an embodiment, when the UE may know that URLLC informationis to be transmitted in advance, transmission of the informationregarding whether the scheduling is performed may be omitted.

According to an embodiment, when the UE requests scheduling to the basestation, the information regarding whether the scheduling is performedmay be transmitted together with uplink scheduling request information.

In applying the embodiment, the UE may define an action (e.g., blinddecoding) for finding a UL grant not to be performed during subsequentconsecutive N subframes after receiving the UL grant in a specificsubframe.

Hereinafter, an operation related to the cross cell scheduling will bedescribed in detail with reference to FIGS. 11 and 12.

FIGS. 11 and 12 illustrate examples of scheduling for cell cyclinguplink transmission according to an embodiment of the presentdisclosure.

FIG. 11 illustrates an example in which a resource scheduled in thefirst subframe is continued during a plurality of consecutive subframesand FIG. 12 illustrates an example in which the resource scheduled inthe first subframe is hopped according to a predetermined rule duringthe plurality of consecutive subframes. When the resource is hopped,there may be an advantage that a frequency diversity gain may be furtherobtained in a situation in which channel quality measurement formultiple cells is not sufficiently performed. When supporting both acase where the resource is hopped and a case where the resource is nothopped, a signaling for whether the resource is hopped may be indicatedto the UE as physical layer or higher layer information. In thisexample, a TDD system is assumed, but even in the case of an FDD system,a downlink control channel and an uplink data channel may be allocatedto different frequency bands and similarly applied.

In FIGS. 11 and 12, a basic unit that switches the uplink transmissionto the cells/base stations/RPs is assumed as the subframe, but a scopeof the present disclosure is not limited to the corresponding example.That is, the uplink transmission may be switched in units of a pluralityof symbol groups.

FIG. 13 illustrates an example of performing the cell cycling uplinktransmission in units of a symbol group according to an embodiment ofthe present disclosure. FIG. 13 illustrates an example of binding a3-symbol unit and alternatively transmitting the bound symbols to theplurality of RPs.

Hereinafter, for convenience of description, a unit time ofalternatively performing transmission to the cell/base station/RP, forexample, the subframe in FIGS. 11 and 12 and the 3 symbol unit in FIG.13 will be referred to as a time unit (TU).

Referring to FIG. 13, at least one uplink (UL) demodulation referencesignal per TU is transmitted. The reason is that the cell/basestation/RP that is to receive the UL demodulation reference signal isdifferent for each TU.

Hereinafter, an operation related to a downlink control signaling forindicating a sequence of the RPs will be described.

The network signals, to the UE, at least one information of (a) and (b)below for a plurality of cells/base stations/RPs that are to participatein receiving uplink data.

(a) Cell/base station/RP ID information to be received in each TU

(b) Physical resource position and/or sequence information of thereference signal in the cell/base station/RP ID to be received in eachTU

Since the reference signal transmitted to each TU is received bydifferent cells/RPs, physical resource positions (time/frequencies)and/or sequences corresponding to different cells/RP IDs may be used.Therefore, the information should be signaled in order for the UE totransmit the reference signals. As an example, the participating cell/RPID may be directly transmitted as in (a). Alternatively, a scrambling IDof the reference signal may be transmitted as in (b), and in this case,the network may inform the UE of scrambling ID set information of thereference signals consecutively transmitted through the physical layeror higher layer message.

In particular, since a previously defined cell/RP ID and the scramblingID for the reference signal may be used for a cell/RP giving the uplinkgrant in a first TU, only information on subsequent reference signalsmay be signaled except for information on the first TU.

Hereinafter, muting will be described in relation to a timing advancefor cell cycling.

The UE that transmits consecutive TUs may apply different timing advance(TA) values for each TU. In this case, it is preferable that the symbolis muted at a TU boundary point. The reason is that when the UEtransmits the signals to base stations which exist physically atdifferent distances, uplink time synchronization may be different foreach TU.

As an example, when the UE transmits N consecutive TUs, the UE may mutea last symbol of a 1^(st) TU to an (N−1)th TU or a first symbol of a2^(nd) TU to an Nth TU and then apply an independent TA value for eachTU.

As another example, the symbol muting may be performed only if thedifference in the TA value satisfies a specific condition. For example,muting may be performed only if the TA value of a subsequent TU islarger than the TA value of a previous TU.

The muting operation may be variously interpreted as transmissionomission for a specific physical signal or channel, or a puncturingoperation or a rate matching operation for resource elements (REs)corresponding to a corresponding symbol corresponding to the specificphysical channel.

FIG. 14 illustrates an example of a muting operation during the cellcycling uplink transmission according to an embodiment of the presentdisclosure.

FIG. 14 illustrates a case where since the TA value in a second TU islarger than the TA value in a first TU, the first symbol in the secondTU may not be transmitted. Referring to FIG. 14, the first symbol in thesecond TU is muted. If the TA value in the second TU is smaller than theTA value in the first TU, muting need not be performed.

Hereinafter, an operation related to uplink synchronization will bedescribed.

Method 1—The network previously provides a base station/cell/RP listwhich has a possibility to perform consecutive transmission to the UEthrough the higher layer signaling. The UE that receives thecorresponding message transmits a specific uplink signal (e.g., PRACH oruplink reference signal) to each base station/cell/RP to receive setvalues (TA values) for matching uplink time synchronization in advance.Such an operation is to prepare for a case where the UE is to performconsecutive uplink transmission to the base stations/cells/RPs includedin the list.

Method 2—A plurality of base stations/cells/RPs may receive the specificuplink signal (e.g., PRACH or uplink reference signal) of the UE andthen signal, to the UE, the set values (TA values) for matching eachuplink time synchronization.

According to Method 1, after the UE accesses a specific basestation/cell/RP, the UE transmits an uplink signal for acquiring uplinksynchronization setting values for additional base stations/cells/RPs inthe corresponding base station/cell/RP. The UE may receive the uplinksynchronization setting value through such an operation.

According to Method 2, when the UE transmits the specific uplink signal,a plurality of base stations/cells/RPs that are to cyclically receivedata receive the corresponding signal together. As a result, a pluralityof uplink synchronization setting values are signaled separately orthrough a representative base station/cell (e.g., serving cell).

In the present disclosure, uplink transmission to different basestations/cells/RPs which are physically separated is assumed anddescribed, but this does not limit the scope of the present disclosure.When base stations implement at the physically same position operatemultiple frequency bands (carriers), each frequency band is operated asan independent logical cell to extensively apply the embodimentsaccording to the present disclosure.

Further, the methods according to the present disclosure may be extendedto a technology that cyclically performs transmission in a promisedorder in different carriers and similarly, also extended to differentcarriers of different base stations/cells/RPs, in order to obtain thefrequency diversity gain. Further, the methods according to the presentdisclosure may also be applied to a case of performing the uplinktransmission by different (reception) beams or different panelsaccording to a predetermined time unit.

Hereinafter, a method for indicating/mapping a spatial relation to a UEtransmission beam in a TU (group) unit will be described based on theabove-described embodiments.

In the present disclosure, ‘/’ means ‘and’ or ‘or’ according to acontext. In the present disclosure, the method is described based on thePUSCH, but this does not limit the scope of the present disclosure. Thatis, the same/similar method may also be applied to the PUCCH comprisedof a plurality of time units (TUs).

Further, hereinafter, in the proposed method, a case where the PUSCH istransmitted in consecutive slots through downlink control information,but the scope of the embodiment according to the present disclosure isnot limited thereto.

That is, the methods according to the present disclosure may also beapplied to 1) a case of transmitting the PUSCH in consecutive slotsevery specific period (e.g., semi-persistent PUSCH), 2) a case of(semi-statically) granting a UL resource which may be subjected to PUSCHtransmission (for the purpose of URLLC or a voice service) and thentransmitting the PUSCH in the corresponding resource when the UErequires the PUSCH (e.g., grant-free PUSCH), and a case of transmittingthe corresponding PUSCH in the plurality of consecutive slots in thecase of 1) or 2) above.

The ‘consecutive slots’ may be consecutive slots which satisfy aspecific condition. For example, in Time Division Duplex (TDD),consecutive slots may be counted in a state where a downlink slot and aflexible slot in which the number of uplink symbols is equal to or lessthan a specific value are excepted.

According to the above-described proposed contents, one data packet(e.g., transport block, code block group) constituted in a specific unitis repeatedly transmitted throughout multiple time units (TUs), and eachTU or TU group is transmitted so that a reception source (e.g.,reception point (RP), beam, panel) is different. As a result, thereception source varies for each TU (group) as well as a time diversityand combining diversity by repeated transmission, so the TA value of theUE may vary for each TU (group).

Hereinafter, a method for indicating/mapping the spatial relation (seethe CSI related procedure) for a UE transmission beam in units of the TU(group) when the UE beamforms a transmission signal will be proposed.Here, each transmission beam may received by different basestations/TRPs/panels/beams. However, the corresponding operation is notlimited thereto, and according to base station implementation, eachtransmission beam may be simultaneously received by a plurality of basestations/TRPs/panels/beams or a plurality of UE transmission beams mayalso be received as one wide reception beam.

In particular, the present disclosure proposes a method or a rule formapping a plurality of spatial relation RSs and TUs according to thetotal number N of (consecutively) allocated TUs and the total number Mof spatial relation RSs.

For convenience of description, hereinafter, in the present disclosure,the TU will be assumed as the slot (or slot group). However, the presentdisclosure is not limited thereto, and the methods according to thepresent disclosure may also be applied to a case of constituting the TUat a symbol (group) level. That is, the time unit (TU) may be defined inunits of the symbol or slot.

In a current NR standard, a spatial relation RS for the SRS or PUSCH isconfigured to indicate one of an SRS Resource Indicator (SRI), a CRS-RSResource Indicator (CRI), and SS/PBCH Resource Indicator (SSBRI), and aspatial relation RS for the PUSCH is configured to indicate an SRI(s)(for codebook or non-codebook based UL transmission).

Here, in Rel-15, in the case of codebook based UL, one SRI may beindicated in DCI format 0-1 and in the case of non-codebook based UL,SRI(s) may be indicated as large as the number of transmission layers inDCI format 0-1.

In the following description, the term spatial relation RS will be usedinstead of the SRI so as to be applied to the PUCCH in addition to thePUSCH, and for convenience, a main example will be described based onthe codebook based UL.

In the case of the non-codebook based UL transmission, ‘one SRI’ may bechanged to SRIs as large as the number of layers' in the followingproposed methods.

Further, the term spatial relation RS as RS information for an uplinkbeam indication may be expressed while being replaced with another termsuch as downlink transmission configuration indicator (TCI) used for abeam indication in downlink or an uplink TCI, an uplink QCL RS, or a TCI(integrated between downlink and uplink) as a term corresponding to QCLRS information.

When applying the embodiment according to the present disclosure,representative information exchange between the base station and the UE,and representative operations of the base station and the UE aredescribed below.

Step 1 (Base Station→UE)

1) The base station may configure/indicate a TU group configuration forthe multi-TU PUSCH and spatial relation RS(s) information (i.e.,transmission beam information) to be applied for each TU group to theUE. The time unit (TU) may be the symbol or slot.

The information may be comprised of multiple detailed information, andeach detailed information may be transferred to the UE through differentmessages stepwise. For example, whether the multi-TUs are configured andTU grouping information may be transferred through the RRC message andthe spatial relation RS(s) information may be transferred through amultiple access control (MAC) control element (CE) or downlink controlinformation (DCI).

2) The base station may trigger transmission of the multi-TU PUSCHthrough the downlink control information (DCI). As another example, thebase station may activate the transmission of the multi-TU PUSCH throughthe downlink control information (DCI) or the Multiple Access Control(MAC) Control Element (CE).

In this case, the base station may transmit (some of) spatial relationRS(s) information to be applied for each slot group together.

An operation related to the triggering/activation may be omitted in acase where the embodiment according to the present disclosure is appliedto a multi-TU PUCCH or a grant-free PUSCH.

Step 2 (UE→Base Station)

1) The UE may receive a TU group configuration for the multi-TU PUSCHand spatial relation RS(s) information (i.e., transmission beaminformation) to be applied for each TU group.

The information may be comprised of multiple detailed information, andeach detailed information may be received through different messagesstepwise. For example, whether the multi-TUs are configured and the TUgrouping information may be transferred through the RRC message and thespatial relation RS(s) information may be transferred through the MAC CEor DCI.

2) The UE may receive a message for triggering or activating thetransmission of the multi-TU PUSCH. The message may be the downlinkcontrol information (DCI) or the multiple access control (MAC) controlelement (CE).

In this case, the UE may receive (some of) spatial relation RS(s)information to be applied for each TU group together.

A receiving operation related to the triggering/activation may beomitted in a case where the embodiment according to the presentdisclosure is applied to the multi-TU PUCCH or the grant-free PUSCH.

3) The UE may determine a PUSCH transmission beam (spatial domainfilter) to be applied to the corresponding TU group from the spatialrelation RSs indicated/configured for each TU group of the multi-TUPUSCH. The UE may transmit the PUSCH in the corresponding TU group byusing the determined PUSCH transmission beam (spatial domain filter).

The UE may operate as follows in relation to the determination of thePUSCH transmission beam (spatial domain filter) to be applied to thecorresponding TU group from the spatial relation RSs.

When the spatial relation RS is an uplink reference signal (UL RS)(e.g., SRS), the UE may configure the PUSCH transmission beam with abeam that transmits the corresponding uplink reference signal.

When the spatial relation RS is a downlink reference signal (DL RS)(e.g., CSI-RS, SRS), the UE may configure the PUSCH transmission beamwith a transmission beam corresponding to the corresponding downlinkreference signal reception beam.

The configuration of the ‘transmission beam corresponding to thereception beam’ may vary according to UE implementation. As an example,the UE may constitute the same spatial domain filter as the receptionbeam with the transmission beam. As another example, the UE mayarbitrarily perform a correspondence relationship between thetransmission beam and the reception beam and then use an (optimal)transmission beam corresponding to an (optimal) reception beam for thecorresponding downlink reference signal (DL RS).

Step 3 (Base Station)

The base station may operate as follows in order to receive the multi-TUPUSCH.

The base station may receive the PUSCH (and DMRS) by using theTRP/panel/beam that receives the spatial relation RS(s)configured/indicated for each TU group that constitutes the multi-TUPUSCH. As another example, the base station may receive the PUSCH (andDMRS) by using the TRP/panel/beam that is determined to be suitable forreception of the corresponding Spatial Relation RS(s).

Each TU group that constitutes the multi-TU PUSCH may be simultaneouslyreceived by the plurality of TRPs/panels/beams.

The receiving operation of the multi-TU PUSCH may vary according to thebase station implementation, and a standardized operation may not bedefined.

The UE (repeatedly) transmits a signal (containing the same information)through different transmission beams for each TU group (or TU) asdescribed above to increase a communication success probability evenwhen a link quality between a specific transmission beam and the basestation deteriorates due to blockage of a ray and/or beam, UE rotation,UE mobility, etc. The reason is that the link quality with another TRP,panel, and/or beam may be relatively excellent even when a quality of aspecific link deteriorates.

Hereinafter, an operation of the base station that indicates the spatialrelation RS(s) which the UE is to apply for each TU group constitutingthe multi-TU PUSCH will be described. Methods to be described below arejust distinguished for convenience and it is needless to say that somecomponents of any one method may be substituted with some components ofanother method or may be applied in combination with each other.

Embodiment 1

A method may be considered in which the base stationconfiguring/indicating the multi-TU PUSCH to the UE separately indicatesthe spatial relation RS(s) which the UE is to apply for each TU group.

The multi-TU PUSCH may be a PUSCH transmitted in N time units (TUs).

The base station that configures/indicates the multi-TU PUSCH to the UEdivides N TUs into K TU groups to separately indicate the spatialrelation RS(s) which the UE is to apply for each TU group.

In Embodiment 1 above, even in the case of codebook based ULtransmission, the base station may indicate a plurality of spatialrelation RSs for each TU group according to a UE capability.

For example, if the UE may be mounted with a plurality of transmissionpanels, and may transmit one (or one or more) beam per each panel or theUE is capable of simultaneously transmitting a plurality of beams in asingle panel, the UE may apply two or more transmission beams for eachTU group.

Specifically, when the base station indicates, to the corresponding UE,spatial relation RSs={SRI #0, SRI #1} to be applied in TU Group #0 andspatial relation RSs={SRI #2, SRI #3} to be applied in TU Group #1, theUE may use both a beam used when transmitting SRI #0 and a beam usedwhen transmitting SRI #1 in TU group #0 and use both a beam used whentransmitting SRI #2 and a beam used when transmitting SRI #3 in TU group#1.

According to an embodiment, each of the spatial relation RSs indicatedfor each TU group may be applied to a specific layer group or applied toall layers.

A specific example of transmission of a layer group unit will bedescribed below.

As an example, it is assumed that transmission in which a rank value isset to 4 for spatial relation RSs={SRI #0, SRI #1} to be applied in TUgroup #0 as in the above-described example is indicated. If layer groupinformation is indicated like 1st layer group={1st layer and 2nd layer}and 2nd layer group={3rd layer and 4th layer}, the UE uses a beam usedwhen transmitting SRI #0 for transmission of the 1st layer group of thecorresponding TU group and a beam used when transmitting SRI #1 fortransmission of the 2nd layer group of the corresponding TU group.

As another example, the transmission may also be applied to the samelayer group. This corresponds to a case of simultaneously transmittingthe same signal by a plurality of beams. That is, if rank=4 is indicatedlike the above example, the UE transmits all layers (4 layers) by a beamused when transmitting SRI #0 (through a specific panel/antenna group/RFchain) and transmits all layers (4 layers) used when transmitting SRI #1(through another panel/antenna group/RF chain).

The base station may configure, to the UE, which mode of twotransmission modes (layer group unit transmission and all layerredundancy transmission) is to be applied.

In codebook (CB) based UL transmission, a single or a plurality ofspatial relation RS(s) may be indicated for one TU group, and in thiscase, each spatial relation RS indicator (e.g., SRI) may be indicatedtogether with a separate Transmitted Precoding Matrix Indicator (TPMI)and a separate Transmit Rank Indicator (TM).

That is, the UE configures an (analog) beam with spatial relation RSinformation indicated when transmitting the PUSCH in the correspondingTU group and constitutes a precoding matrix for transmitting thecorresponding PUSCH with TPMI and TRI information mapped with thecorresponding spatial relation RS.

When a plurality of spatial relation RS information is indicated to thesame TU group for the codebook based uplink transmission, theTransmitted Precoding Matrix Indicator (TPMI) and the Transmit RankIndicator (TM) are indicated to each spatial relation RS (e.g., the TPMIand the TRI are indicated for each panel).

As another example, the TPMI may be separately indicated for eachspatial relation RS and the TRI may be indicated as one common value.Specifically, when the indicated TRI is 2, two layers may be repeatedlytransmitted to each panel every time and one layer may be transmitted ineach panel of a UE having two panels every time. In this case, the TRIvalue may be configured to use a defined value (e.g., TRI=1, i.e., onelayer per each panel.

As yet another example, one (master) TPMI/TRI may be indicated for theplurality of spatial relation RSs. Specifically, when each of 4 port SRI#0 and 4 port SRI #1 is indicated as the spatial relation RS in aspecific TU group (for the CB based UL transmission), one TPMI/TRI maybe indicated based on 8 Tx by adding ports of two SRS resources. Here,the TPMI is a matrix index selected in an 8 port codebook. Multi-TUtransmission may be fixed to TM=1 for the purpose of the URLLC. In thiscase, only the TPMI(s) is indicated and in this case, the TPMI is anindex selected in a rank 1 codebook.

In the case of non-CB based UL, SRIs may be indicated as large as thetotal number of layers to be transmitted for each TU group. Here, sincesome of the SRIs may be transmitted in the same (analog) beam and theremaining SRIs may be transmitted in different (analog) beams, spatialrelation RSs of SRIs constituting the indicated SRIs may be differentfrom each other.

For example, when four SRIs are indicated for rank 4 transmission, thespatial relation of two SRIs may be CRI #0 and the spatial relation ofthe remaining two SRIs may be CRI #1. The UE may transmit first two SRIswith the same (analog) beam and different digital beams. The UE maytransmit the remaining two SRIs with the same (analog) beam anddifferent digital beams. The different digital beams may be differentlyprecoded beams. As a result, first two layers and remaining two layersof the PUSCH transmitted in the corresponding TU group may betransmitted with different beams.

As another method, the base station may indicate/configure tosimultaneously transmit the same layer(s) with a plurality of beams(according to the UE capability). This means, in particular, indicatingthe plurality of spatial relation RSs (e.g., SRIs) for the same layer(s)(or UL DMRS port(s)).

That is, unlike indicating 1-port SRIs which are as many as transmissionranks in the legacy non-codebook based transmission, the base stationmay 1) indicate X-port SRIs which are as many as transmission ranks or2) indicate SRIs which are as large as a value acquired by multiplyingthe transmission rank by X. Here, X corresponds to the number of spatialrelations or the number of beams to perform simultaneous transmission.

When the X is the number of spatial relations to perform thesimultaneous transmission, a plurality of ports included in one SRSresource are reference signals which may be simultaneously transmittedwith different beams (through different panels/antenna groups/RFchains), respectively. As an example, the base station may indicateeight SRIs to the UE for rank 4 transmission, and in this case, the UEmaps two SRIs to each layer (according to a specific rule or a basestation configuration) and then simultaneously transmits the layer withthe beams for transmitting two SRIs mapped at the time of transmittingeach layer (through different panels/antenna groups/RF chains).

SRS resources which (are transmitted in different panels) may besimultaneously transmitted and SRS resources which (are transmitted inthe same panel) may not be simultaneously transmitted may be separatelyconfigured at the time of configuring the SRS. As an example, it may beimpossible to simultaneously transmit SRS resources in the same SRSresource set and it may be possible to simultaneously transmit SRSresources which belong to different SRS resource sets.

In other words, all of the SRS resources which belong to the SRSresource set may be physically transmitted in all same transmissionpanels (with different beams or the same beam), and when the number ofSRS resource sets is set to X, the UE may generate beams in Xtransmission panels, respectively and transmit the generated beams inthe corresponding SRS resources, respectively. In this case, it is morepreferable that when the plurality of SRIs are indicated for each TUgroup, there is a feature that SRIs indicated in the same TU groupbelong to different SRS resource sets, respectively. In this case, SRIsindicated in different TU groups may be included in the same SRSresource set (because the SRIs are transmitted at different times).

As in Embodiment 1 above, in order for the UE to be configured totransmit the beam for transmission of the multi-TU PUSCH while changingthe corresponding beam in units of the TU group, spatial relation RSinformation which should be indicated by the base station increases.Hereinafter, methods for more efficiently indicating the spatialrelation RS information will be described. In other words, methods forminimizing a payload size (e.g., DCI payload size) of controlinformation indicating the spatial relation RS information will bedescribed in detail.

Embodiment 1-1

A method for indicating spatial relation RS set information to beapplied to K TU groups as one spatial relation state may be considered.

Specifically, the base station may configure, to the UE, a plurality ofspatial relation states through the higher layer message (e.g., RRCmessage) and then indicate one of the plurality of spatial relationstates through a lower layer message (e.g., DCI or MAC-CE).

-   -   The lower layer message may be downlink control information to        trigger the transmission of the multi-TU PUSCH. Alternatively,        the lower layer message may be downlink control        information (DCI) or a Multiple Access Control (MAC) Control        Element (CE) for activating semi-persistent transmission of the        multi-TU PUSCH.    -   In this case, a size of a field indicating the spatial relation        state in the downlink control information (DCI) may be        determined by the number of spatial relation states configured        by the higher layer message. For example, the size of the field        may be a minimum value among n (natural number) values according        to 2{circumflex over ( )}n which is equal to or larger than the        total number of configured states. In this case, the n value may        mean the number of bits of the field.

Examples of the specific operation according to Embodiment 1-1 above aredescribed below.

1) When the number of TU groups, K is 4, the base station may operate asfollows.

The base station may configure two states through RRC like spatialrelation state #0={SRI #0, SRI #1, SRI #2, SRI #3} and spatial relationstate #1={SRI #0, SRI #1, SRI #0, SRI #1} and then indicate one of twostates with 1-bit downlink control information (DCI). Here, a k-thelement means a spatial relation RS to be applied to a k-th TU group.That is, k=1, 2, 3, 4. The base station may configure or indicate thesame spatial relation RS to multiple TU groups.

2) When the UE is capable of simultaneously transmitting two beams whilethe number of TU groups, K is 2, the base station may operate asfollows.

The base station may configure two states through RRC like spatialrelation state #0={SRI #0, SRI #1, SRI #2, SRI #3} and spatial relationstate #1={SRI #0, SRI #1, SRI #0, SRI #1} and then indicate one of twostates with 1-bit downlink control information (DCI). Here, 1st & 2ndelements mean two spatial relation RSs to be applied to a first TU groupand 3rd & 4th elements mean two spatial relation RSs to be applied to asecond TU group.

3) When the UE is capable of simultaneously transmitting X (=2) beamswhile the number of TU groups, K is 2, and two SRS resources(transmitted with different beams in the same panel) which may not besimultaneously transmitted are configured in one SRS resource set, thebase station may operate as follows. It is assumed that SRS resource set#0={SRI #0, SRI #1} and SRS resource set #1={SRI #2, SRI #3}, andresources in a set may not be simultaneously transmitted and SRSresources which belong to different sets may be simultaneouslytransmitted (are transmitted in different panels).

In this case, the base station may configure four spatial relationstates through the RRC as follows.

spatial relation state #0={1st SRI in the SRS resource set #0, 2nd SRIin the SRS resource set #1},

spatial relation state #1={2nd SRI in the SRS resource set #0, 1st SRIin the SRS resource set #1},

spatial relation state #2={1st SRI in the SRS resource set #1, 1st SRIin the SRS resource set #0},

spatial relation state #3={2nd SRI in the SRS resource set #1, 2nd SRIin the SRS resource set #0}

The base station may indicate X (=2) states for each TU group with 4-bitdownlink control information. The bit is a value according to X (=2)×2.

Here, a k-th element means a spatial relation RS to be applied to a k-thTU group. That is, k=1, 2.

When the base station indicates 1st spatial relation state=#0 and 2ndspatial relation state=#3 as the downlink control information (DCI), theUE may operate as follows.

The spatial relation state for a first TU group is {1st SRI in SRSresource set #0, 2nd SRI in SRS resource set #1}. In other words, thespatial relation state for the first TU group is {SRI #0, SRI #3}.

The UE may constitute a PUSCH beam to transmit the 1st TU group by usingtwo beams for transmitting SRI #0 (transmitted in a first panel) and SRI#3 (transmitted in a second panel).

The spatial relation state for a second TU group is {1st SRI in SRSresource set #1, 2nd SRI in SRS resource set #0}. In other words, thespatial relation state for the second TU group is {SRI #1, SRI #3}.

The UE may constitute a PUSCH beam to be transmitted in the 2nd TU groupby using two beams for transmitting SRI #1 (transmitted in the firstpanel) and SRI #3 (transmitted in the second panel).

Hereinafter, a method for performing more efficient signaling byaccessing in a different direction from Embodiment 1-1 will bedescribed.

Embodiment 1-2

The spatial relation RS(s) information to be applied to each TU groupmay be separately indicated/configured. Hereinafter, this will bedescribed in detail in Methods 1 to 3.

Method 1) The base station may previously configure spatial relationRS(s) for all TU groups through the higher layer message (e.g., RRCand/or MAC-CE). The base station may omit the indication of the spatialrelation RS(s) or indicate a random (or promised) spatial relation RS(e.g., SRI) in a message (e.g., DCI) for triggering/activatingscheduling of the multi-TU PUSCH. The random (or promised) spatialrelation RS may be irrelevant to a spatial relation RS(s) which the UEis to actually apply.

Method 2) The base station may previously configure/indicate remaining(K-D) spatial relation RS set(s) other than D spatial relation RS set(s)to be applied to a specific TU group(s) among K spatial relation RS setsthrough the higher layer message. The base station may indicate thespatial relation RS set(s) to be applied to the specific TU group(s)through the downlink control information (DCI) for scheduling themulti-TU PUSCH (e.g., D=1).

The ‘spatial relation RS set’ means a set of one or a plurality ofspatial relation RSs applied to single TU PUSCH transmission. Forexample, in the codebook based PUSCH, in a single-panel UE, the spatialrelation RS set may be one single SRI for CB based UL PUSCH (with singlepanel)) and when the rank value is R in the non-codebook based PUSCH,the spatial relation RS set may be R SRIs (R SRIs for non-CB based ULPUSCH where R=transmit rank for PUSCH).

A default spatial relation value may be promised/defined for moreefficient signaling. Specifically, in a case where the indication of thespatial relation RS set is omitted or a specific promised spatialrelation RS set value is indicated in the downlink control informationfor scheduling the multi-TU PUSCH (scheduling DCI) for scheduling themulti-TU PUSCH (e.g., SRI=0) or in a case where downlink format 0-0 (DCIformat 0-0) is used, the default spatial relation values used in theabove cases may be promised/defined.

An example of the default spatial relation is described below.

Same spatial relation as the PUCCH with lowest ID and same spatialdomain filter used for transmitting most recent preamble random accesschannel (PRACH).

An example of the specific TU group is described below. The specific TUgroup may be configured as an initially transmitted TU group among aplurality of TU groups constituting the corresponding PUSCH or a TUgroup corresponding to a lowest TU group index.

Method 3) The base station may indicate K all spatial relation RS set(s)through the downlink control information for scheduling the multi-TUPUSCH (scheduling DCI).

In the above method, some of K spatial relation RS set(s) mayconfigure/define some of K spatial relation RS set(s) to apply thedefault spatial relation proposed in Method 2 in order to reducedownlink control information (DCI) overhead. In this case, onlyremaining spatial relation RS set(s) other than the TU group(s) to whichthe default spatial relation is to be applied among K spatial relationRS set(s) may be indicated through the downlink control information(DCI).

In the above method, in order to reduce the downlink control information(DCI) overhead, the base station may configure a (compact) spatialrelation RS list to be used in the case of the multi-TU PUSCH throughthe higher layer signaling. A payload size of the downlink controlinformation (DCI) for indicating the spatial relation of each TU groupmay be configured/defined according to the size of the list.

The spatial relation RS list for the multi-TU PUSCH may be configured asa subset of a spatial relation RS list for a single TU PUSCH.

For example, a total of four SRS resources may be configured for thepurpose of the codebook based UL, but the list may be configured toinclude only two SRS resources among four SRS resources. In the case ofthe single TU PUSCH, the base station designates one SRI among fourresources with 2-bit information. In the case of the multi-TU PUSCH, thebase station may designate one SRI of two with the 1-bit information foreach TU group.

Similarly, even in the case of the non-codebook (CB) based UL, a payloadof the downlink control information may be reduced through a method forseparately designating the SRS resource list which becomes a candidatein the case of the multi-TU PUSCH.

In application of the method, a spatial relation RS list to be used maybe separately configured according to the number K of TU groupsindicated with the downlink control information (DCI) or the totalnumber N of TUs constituting the PUSCH.

For example, a list may be configured, which is comprised of a smallernumber of spatial relation RSs in order to maximally reduce the DCIpayload by reducing the number of candidate spatial relation RSs foreach TU group as K is larger (e.g., in the case of K=1, 8 SRIs (3 bits),in the case of K=2, 4 SRIs (2 bits), and in the case of K=3, 2 SRIs (1bit)).

Methods 1 to 3 described above may be used in combination with eachother together with the K value or the N value. For example, it may bedefined that if K or N is equal to or less than a specific value, Method3 is used and if K or N is more than the specific value, Method 1 or 2is used.

When Embodiment 1 above is applied, the following signal/operation flowis exemplarily enabled in the base station.

Step 1 (Base Station→UE)

1) The base station may configure/indicate a TU group configuration forthe multi-TU PUSCH and spatial relation RS(s) (i.e., transmission beaminformation) to be applied for each TU group to the UE. The time unit(TU) may be defined in units of the symbol or slot.

The information may be comprised of multiple detailed information, andeach detailed information may be transferred to the UE through differentmessages stepwise. For example, whether the multi-TUs are configured andTU grouping information may be transferred through the RRC message andthe spatial relation RS(s) information may be transferred through amultiple access control (MAC) control element (CE) or downlink controlinformation (DCI).

2) The base station may trigger transmission of the multi-TU PUSCHthrough the downlink control information (DCI). As another example, thebase station may activate the transmission of the multi-TU PUSCH throughthe downlink control information (DCI) or the Multiple Access Control(MAC) Control Element (CE).

In this case, the base station may transmit (some of) spatial relationRS(s) information to be applied for each slot group together.

An operation related to the triggering/activation may be omitted in acase where the embodiment according to the present disclosure is appliedto a multi-TU PUCCH or a grant-free PUSCH.

The UE (repeatedly) transmits a signal (containing the same information)through different transmission beams for each TU group (or TU) asdescribed above to increase a communication success probability evenwhen a link quality between a specific transmission beam and the basestation deteriorates due to blockage of a ray and/or beam, UE rotation,UE mobility, etc. The reason is that the link quality with another TRP,panel, and/or beam may be relatively excellent even when a quality of aspecific link deteriorates.

Hereinafter, an operation of the corresponding UE in which the basestation that indicates the spatial relation RS(s) which the UE is toapply for each TU group constituting the multi-TU PUSCH will bedescribed. Embodiment 2 below is related to each method in Embodiment 1described above and the operation of the UE corresponding to theembodiment. Methods to be described below are just distinguished forconvenience and it is needless to say that some components of any onemethod may be substituted with some components of another method or maybe applied in combination with each other.

Embodiment 2

The UE that is configured/indicated with the multi-TU PUSCH from thebase station may apply the configured/indicated spatial relation RS(s)for each TU group.

The multi-TU PUSCH may be a PUSCH transmitted in N time units (TUs). TheUE divides N time units (TUs) into K TU groups to apply theconfigured/indicated spatial relation RS(s) for each TU group.

In Embodiment 2 above, in the case of the codebook based ULtransmission, the UE may be indicated with the plurality of spatialrelation RSs for each TU group according to the UE capability.

For example, if the UE may mount a plurality of transmission panels, andmay transmit one (or one or more) beam per each panel or the UE iscapable of simultaneously transmitting a plurality of beams in a singlepanel, the UE may be indicated to apply two or more transmission beamsfor each TU group.

In the case of the non-CB based UL, the UE may be indicated with SRIs aslarge as the total number of layers to be transmitted for each TU group.Here, since some of the indicated SRIs may be transmitted in the same(analog) beam and the remaining SRIs may be transmitted in different(analog) beams, spatial relation RSs of SRIs constituting the indicatedSRIs may be different from each other.

When the UE is configured/indicated with the SRS, the UE may determinewhether to transmit the SRS resource in the same transmission antennagroup/panel according to whether the SRS is an SRS resource whichbelongs to the same SRS resource set. As an example, all of the SRSresources which belong to the SRS resource set are physicallytransmitted in all same transmission panels (with different beams or thesame beam), and when the number of SRS resource sets is set to X, the UEmay generate beams in X transmission panels, respectively and transmitthe SRS resources. In this case, it is more preferable that when theplurality of SRIs are indicated for each TU group, there is a featurethat SRIs indicated in the same TU group belong to different SRSresource sets, respectively. In this case, SRIs indicated in differentTU groups may be included in the same SRS resource set (because the SRIsare transmitted at different times).

In that as in Embodiment 1 above, in order for the UE to be configuredto transmit the beam for transmission of the multi-TU PUSCH whilechanging the corresponding beam in units of the TU group, spatialrelation RS information which should be indicated by the base stationincreases, the same methods as in Embodiments 1-1 and 1-2 are proposed.Hereinafter, each of the operations of the UE that receives thesignaling of the base station according to Embodiments 1-1 and 1-2 abovewill be described.

Embodiment 2-1

The UE may be configured with a plurality of spatial relation statesthrough the higher layer message (e.g., RRC) and then indicated with oneof the plurality of spatial relation states through a lower layermessage (e.g., DCI or MAC-CE).

The UE that is allocated with multi-TU PUSCH transmission resources (andindicated with transmission) may divide multiple TUs into K TU groups.The UE may determine/apply a spatial relation RS set to be applied toeach of K TU groups according to information designated in a finallyindicated spatial relation state. The UE may transmit the multi-TU PUSCHby determining a beam (spatial domain filter) to be transmitted in eachTU group as described above.

-   -   The lower layer message may be downlink control information to        trigger the transmission of the multi-TU PUSCH. Alternatively,        the lower layer message may be downlink control        information (DCI) or a Multiple Access Control (MAC) Control        Element (CE) for activating semi-persistent transmission of the        multi-TU PUSCH.    -   In this case, a size of a field indicating the spatial relation        state in the downlink control information (DCI) may be        determined by the number of spatial relation states configured        by the higher layer message. For example, the size of the field        may be a minimum value among n (natural number) values according        to 2{circumflex over ( )}n which is equal to or larger than the        total number of configured states. In this case, the n value may        mean the number of bits of the field.

Examples of the specific operation according to Embodiment 2-1 above aredescribed below.

1) When the number of TU groups, K is 4, the UE may operate as follows.

The UE may be configured with two states, i.e., spatial relation state#0={SRI #0, SRI #1, SRI #2, SRI #3} and spatial relation state #1={SRI#0, SRI #1, SRI #0, SRI #1} from the base station through the RRC. TheUE may be indicated with one state of two states with 1-bit downlinkcontrol information (DCI). Here, a k-th element means a spatial relationRS to be applied to a k-th TU group. That is, k=1, 2, 3, 4. The UE maybe configured/indicated with the same spatial relation RS in multiple TUgroups.

2) When the UE is capable of simultaneously transmitting two beams whilethe number of TU groups, K is 2, the UE may operate as follows.

The UE may be configured with two states, i.e., spatial relation state#0={SRI #0, SRI #1, SRI #2, SRI #3} and spatial relation state #1={SRI#0, SRI #1, SRI #0, SRI #1} from the base station through the RRC. Thecorresponding UE may be indicated with one state of two states with the1-bit downlink control information (DCI). Here, 1st & 2nd elements meantwo spatial relation RSs to be applied to a first TU group and 3rd & 4thelements mean two spatial relation RSs to be applied to a second TUgroup.

3) When the UE is capable of simultaneously transmitting X (=2) beamswhile the number of TU groups, K is 2, and two SRS resources(transmitted with different beams in the same panel) which may not besimultaneously transmitted are configured in one SRS resource set, theUE may operate as follows.

It is assumed that the UE transmits SRI #0 and SRI #1 with the same beamor different beams in the same antenna group/panel/RF chain andsimilarly transmits SRI #2 and SRI #3 with the same beam or differentbeams in the same antenna group/panel/RF chain. That is, (SRI #0 or SRI#1) and (SRI #2 or SRI #3) are transmitted in different or the sameantenna group/panel/RF chain.

In this case, the UE may be configured with four spatial relation statesfrom the base station through the RRC as follows.

spatial relation state #0={1^(st) SRI in the SRS resource set #0, 2^(nd)SRI in the SRS resource set #1},

spatial relation state #1={2^(nd) SRI in the SRS resource set #0, 1^(st)SRI in the SRS resource set #1},

spatial relation state #2={1′ SRI in the SRS resource set #1, 1^(st) SRIin the SRS resource set #0},

spatial relation state #3={2^(nd) SRI in the SRS resource set #1, 2^(nd)SRI in the SRS resource set #0}

The UE may be indicated with X (=2) states for each TU group with 4-bitdownlink control information. The bit is a value according to X (=2)×2.

Here, a k-th element means a spatial relation RS to be applied to a k-thTU group. That is, k=1, 2.

The spatial relation state for the first TU group is {1st SRI in SRSresource set #0, 2nd SRI in SRS resource set #1}. In other words, thespatial relation state for the first TU group is {SRI #0, SRI #3}.

The UE may constitute a PUSCH beam to transmit the 1st TU group by usingtwo beams for transmitting SRI #0 (transmitted in a first panel) and SRI#3 (transmitted in a second panel).

The spatial relation state for a second TU group is {1st SRI in SRSresource set #1, 2nd SRI in SRS resource set #0}. In other words, thespatial relation state for the second TU group is {SRI #1, SRI #3}.

The UE may constitute a PUSCH beam to transmit the 2nd TU group by usingtwo beams for transmitting SRI #1 (transmitted in the first panel) andSRI #3 (transmitted in the second panel).

Embodiment 2-2

The method in which the UE is separately indicated/configured with thespatial relation RS(s) information to be applied to each TU group willbe hereinafter described in detail in Methods 1 to 3.

Method 1) The UE may be previously configured with spatial relationRS(s) for all TU groups through the higher layer message (e.g., RRCand/or MAC-CE). The UE may expect that the indication of the spatialrelation RS(s) is omitted in a message (e.g., DCI) fortriggering/activating scheduling of the multi-TU PUSCH or ignore thespatial relation RS(s) (e.g., SRI) indicated by the message. That is,the UE ignores an SRI value indicated by the downlink controlinformation (DCI) and applies a preconfigured spatial relation RS(s)through the higher layer message.

Method 2) The UE may be previously configured/indicated with remaining(K-D) spatial relation RS set(s) other than D spatial relation RS set(s)to be applied to a specific TU group(s) among K spatial relation RS setsthrough the higher layer message. The corresponding UE may be indicatedwith the spatial relation RS set(s) to be applied to the specific TUgroup(s) through the downlink control information (DCI) for schedulingthe multi-TU PUSCH (e.g., D=1).

The ‘spatial relation RS set’ means a set of one or a plurality ofspatial relation RSs applied to single TU PUSCH transmission. Forexample, in the codebook based PUSCH, in a single-panel UE, the spatialrelation RS set may be one single SRI for CB based UL PUSCH (with singlepanel)) and when the rank value is R in the non-codebook based PUSCH,the spatial relation RS set may be R SRIs (R SRIs for non-CB based ULPUSCH where R=transmit rank for PUSCH).

A default spatial relation value may be promised/defined for moreefficient signaling. Specifically, when the indication of the spatialrelation RS set is omitted in the downlink control information forscheduling the multi-TU PUSCH (scheduling DCI) for scheduling themulti-TU PUSCH or a specific promised spatial relation RS set value isindicated (e.g., SRI=0) or when downlink format 0-0 (DCI format 0-0) isused, a default spatial relation value used in the above cases may bepromised/defined.

An example of the default spatial relation is described below.

Same spatial relation as the PUCCH with lowest ID and same spatialdomain filter used for transmitting most recent preamble random accesschannel (PRACH).

An example of the specific TU group is described below. The specific TUgroup may be configured as an initially transmitted TU group among aplurality of TU groups constituting the corresponding PUSCH or a TUgroup corresponding to a lowest TU group index.

Method 3) The UE is indicated with all K spatial relation RS set(s)through the downlink control information for scheduling the multi-TUPUSCH (scheduling DCI).

In the above method, some of K spatial relation RS set(s) mayconfigure/define some of K spatial relation RS set(s) to apply thedefault spatial relation proposed in Method 2 in order to reducedownlink control information (DCI) overhead. In this case, onlyremaining spatial relation RS set(s) other than the TU group(s) to whichthe default spatial relation is to be applied among K spatial relationRS set(s) may be indicated through the downlink control information(DCI).

In the above method, in order to reduce the downlink control information(DCI) overhead, the UE may be configured with a (compact) spatialrelation RS list to be used in the case of the multi-TU PUSCH throughthe higher layer signaling. A payload size of the downlink controlinformation (DCI) for indicating the spatial relation of each TU groupmay be configured/defined according to the size of the list.

The UE may be configured with the spatial relation RS list for themulti-TU PUSCH as a subset of a spatial relation RS list for a single TUPUSCH.

For example, the UE may be configured with a total of four SRS resourcesfor the purpose of the codebook based UL and designated with only twoSRS resources among four SRS resources through the list. In the case ofthe single TU PUSCH, the UE may be designated with and apply one SRIamong four resources with 2-bit information. In the case of the multi-TUPUSCH, the UE may be designated with and apply one SRI of two with the1-bit information for each TU group.

Similarly, even in the case of the non-codebook (CB) based UL, the UE apayload of the downlink control information may be reduced through amethod for being separately designated with the SRS resource list whichbecomes a candidate in the case of the multi-TU PUSCH.

In application of the method, a spatial relation RS list to be used maybe separately configured according to the number K of TU groupsindicated with the downlink control information (DCI) or the totalnumber N of TUs constituting the PUSCH.

For example, the UE may be configured with a list which is comprised ofa smaller number of spatial relation RSs in order to maximally reducethe DCI payload by reducing the number of candidate spatial relation RSsfor each TU group as K is larger (e.g., in the case of K=1, 8 SRIs (3bits), in the case of K=2, 4 SRIs (2 bits), and in the case of K=3, 2SRIs (1 bit)).

Methods 1 to 3 described above may be used in combination with eachother together with the K value or the N value. For example, it may bedefined that if K or N is equal to or less than a specific value, Method3 is used and if K or N is more than the specific value, Method 1 or 2is used.

When Embodiment 2 above is applied, the following signal/operation flowis exemplarily enabled in the UE.

Step 2 (UE→Base Station)

1) The UE may receive spatial relation RS(s) information (i.e.,transmission beam information) to be applied for each TU groupconfiguration and each TU group for the multi-TU PUSCH.

The information may be comprised of multiple detailed information, andeach detailed information may be received through different messagesstepwise. For example, whether the multi-TUs are configured and the TUgrouping information may be transferred through the RRC message and thespatial relation RS(s) information may be transferred through the MAC CEor DCI.

2) The UE may receive a message for triggering or activating thetransmission of the multi-TU PUSCH. The message may be the downlinkcontrol information (DCI) or the multiple access control (MAC) controlelement (CE).

In this case, the UE may receive (some of) spatial relation RS(s)information to be applied for each TU group.

A receiving operation related to the triggering/activation may beomitted in a case where the embodiment according to the presentdisclosure is applied to the multi-TU PUCCH or the grant-free PUSCH.

3) The UE may determine a PUSCH transmission beam (spatial domainfilter) to be applied to the corresponding TU group from the spatialrelation RSs indicated/configured for each TU group of the multi-TUPUSCH. The UE may transmit the PUSCH in the corresponding TU group byusing the determined PUSCH transmission beam (spatial domain filter).

The UE may operate as follows in relation to the determination of thePUSCH transmission beam (spatial domain filter) to be applied to thecorresponding TU group from the spatial relation RSs.

When the spatial relation RS is an uplink reference signal (UL RS)(e.g., SRS), the UE may configured the PUSCH transmission beam as a beamthat sends the corresponding uplink reference signal.

When the spatial relation RS is a downlink reference signal (DL RS)(e.g., CSI-RS, SRS), the UE may configured the PUSCH transmission beamwith a transmission beam corresponding to the corresponding downlinkreference signal.

The configuration of the ‘transmission beam corresponding to thereception beam’ may vary according to UE implementation. As an example,the UE the same spatial domain filter as the reception beam as thetransmission beam. As another example, the UE may arbitrarily perform acorrespondence relationship between the transmission beam and thereception beam and then use an (optimal) transmission beam correspondingto an (optimal) reception beam for the corresponding downlink referencesignal (DL RS).

The UE (repeatedly) transmits a signal (containing the same information)through different transmission beams for each TU group (or TU) asdescribed above to increase a communication success probability evenwhen a link quality between a specific transmission beam and the basestation deteriorates due to blockage of a ray and/or beam, UE rotation,UE mobility, etc. The reason is that the link quality with another TRP,panel, and/or beam may be relatively excellent even when a quality of aspecific link deteriorates.

Embodiment 1/1-1/2/2-2 above proposes a method for indicating allspatial relation RS sets for each TU group.

According to another embodiment, spatial relation RS sets for some TUgroups may be omitted and indicated. The UE may operate as follows forthe TU group in which the indication of the spatial relation RS set isomitted.

1) The UE may transmit a randomly selected beam to the TU group in whichthe indication of the spatial relation RS set is omitted.

2) The UE may transmit a neighboring beam of a beam indicated foranother (or adjacent) TU group to the TU group in which the indicationof the spatial relation RS set is omitted. According to an embodiment,the neighboring beam may be a beam in which a difference of an angle ofdeparture (AOD) is within a specific range.

According to an embodiment, when the base station indicates a singlespatial relation RS set for the multi-TU PUSCH, the UE divides thespatial relation RS set into K TU groups (according to a specific ruleor by a base station configuration) and then obtains an optimal beam setfor the indicated spatial relation RS set. The UE may generate K(neighboring) beam sets randomly or according to the specific rule basedon the corresponding beam set, and sequentially apply and transmit onebeam set for each TU group.

In the case of the above methods, a diversity effect may be maximized bydefining the beam to be changed and applied to the adjacent TU (group),and when all spatial relation RS set indications are extremely omittedfor the multi-TU PUSCH, the UE may apply a random beam(s) while changingthe random beam(s).

Hereinafter, a method for mapping N TUs constituting the PUSCH/PUCCH toK spatial relation RSs will be described in detail. Methods to bedescribed below are just distinguished for convenience and it isneedless to say that some components of any one method may besubstituted with some components of another method or may be applied incombination with each other.

First, matters related to TU grouping are described.

In order to improve reliability, it is preferable to constitutemaximally equal number of TU groups according to a total number of timeunits (TUs), K constituting the PUSCH (aggregationFactorUL) and thenumber and the number of spatial relation RS sets, K. As an example,when N∈{2,4,8,16} and K∈{1,2,3,4} are assumed, the number of TUsincluded in a k-th TU group, N_(k) may be constituted as shown in Table11 below. Values of Table 11 mean {N₁, . . . , N_(K)} which is thenumber of TUs included in each TU group in a combination of thecorresponding N and K values.

TABLE 11 K = 1 K = 2 K = 3 K = 4 N = 2   {2} {1, 1} — — N = 4   {4} {2,2} {2, 1, 1} {1, 1, 1, 1} N = 8   {8} {4, 4} {3, 3, 2} {2, 2, 2, 2} N =16 {16} {8, 8} {6, 5, 5} {4, 4, 4, 4}

Referring to Table 11 above, a deviation of N_(k) values (k=1, . . . ,K) which are the number of TUs included in each TU group is configuredto be small as possible in order to constitute the TU group. With a casewhere N=16 and K=4 as an example, the number of TUs included in each TUgroup becomes 4.

The TU grouping method may be extensively used for a purpose other thanthe purpose for increasing the reliability. In other words, the methodmay be used for a purpose of sending different TBs instead of repeatedlytransmitting the same transport block (TB) to each TU (group) for themulti-TU PUSCH. In this case, the UE may transmit different TBs withdifferent beams for each TU group.

When the additional purpose is considered, in addition to a combinationin which deviation of N_(k) values (k=1, . . . , K), an application of acombination in which the deviation is large may also be considered insome cases. Therefore, the base station may configure/indicate a methodfor distribution the number of TUs for each TU group to be applied (anda method for mapping the spatial relation RS set for each TU in thecorresponding distribution method) to the UE.

The operation related to the TU grouping based on Table 11 above may beperformed by various methods according to a hardware condition of theUE.

Specifically, the hardware condition may be related to at least one ofbeam/panel switching or power. As an example, the hardware condition maymean a beam/panel switching delay or a power transition time.

1) Case where a guard symbol (i.e., a muted symbol) is not requiredbetween consecutive symbols in which the beam is changed even though theTB is transmitted while switching the beam

2) Case where the timing advance (TA) to be applied for each beam is thesame (or a difference value is within a specific value)

3) Any one of a case where a power difference to be applied for eachbeam is within a predetermined value, a case where the power transitiontime is within a specific time, or a case where the same power controlis applied

When the UE corresponding to at least one of 1) to 3) above transmitsthe TB while frequently changing the beam according to the hardwarecondition, a time diversity may be maximized. When the TB is transmittedwhile frequently changing the beam as described above, the TU grouptransmitted with the same beam is disposed throughout a maximum widetime area. That is, a time interval between TU groups transmitted withthe same beam may be maximized.

An example of such a method is shown in Table 2 below. Values in Table 2mean {K₁, . . . , K_(N)} in the combination of the corresponding N and Kvalues, and K_(n) means an index of a spatial relation RS set to beapplied in an n-th TU. K_(n)∈{1, . . . , K}. A proposal method of Table12 has a feature that the spatial relation RS set index is sequentiallymapped every each TU index. This method is referred to as a ‘fullshuffling method’ for convenience. According to the ‘full shufflingmethod’, the mapped spatial relation RS varies every TU.

Table 12 shows a method for mapping the spatial relation RS set for eachTU.

TABLE 12 K = 1 K = 2 K = 3 K = 4 N = 2  {1, 1} {1, 2} — — N = 4  {1, 1,1, 1} {1, 2, 1, 2} {1, 2, 3, 1} {1, 2, 3, 4} N = 8  {1, 1, 1, 1, 1, 1,1, 1} {1, 2, 1, 2, 1, 2, 1, 2} {1, 2, 3, 1, 2, 3, 1, 2} {1, 2, 3, 4, 1,2, 3, 4} N = 16 {1, 1, 1, 1, 1, 1, 1, 1, {1, 2, 1, 2, 1, 2, 1, 2, {1, 2,3, 1, 2, 3, 1, 2, {1, 2, 3, 4, 1, 2, 3, 4, 1, 1, 1, 1, 1, 1, 1, 1} 1, 2,1, 2, 1, 2, 1, 2} 3, 1, 2, 3, 1, 2, 3, 1} 1, 2, 3, 4, 1, 2, 3, 4}

Meanwhile, a method for minimizing the number of beam change times by aTA condition related to the hardware condition depending on the UEcapability and power control conditions may be considered.

Specifically, if a guard time is required or a burden such as furtheroccurrence of power consumption occurs when the UE changes the beam, itmay be more preferable to minimize the number of beam change times as ina method of Table 13 below. As a feature of the method of Table 13, thek-th TU group is mapped to N_(k) consecutive TUs to minimize the numberof times of changing the spatial relation RS. This method is referred toas a ‘sequential mapping method’ for convenience.

TABLE 13 K = 1 K = 2 K = 3 K = 4 N = 2  {1, 1} {1, 2} — — N = 4  {1, 1,1, 1} {1, 1, 2, 2} {1, 1, 2, 3} {1, 2, 3, 4} N = 8  {1, 1, 1, 1, 1, 1,1, 1} {1, 1, 1, 1, 2, 2, 2, 2} {1, 1, 1, 2, 2, 2, 3, 3} {1, 1, 2, 2, 3,3, 4, 4} N = 16 {1, 1, 1, 1, 1, 1, 1, 1, 1, {1, 1, 1, 1, 1, 1, 1, 1, 2,{1, 1, 1, 1, 1, 1, 2, 2, 2, {1, 1, 1, 1, 2, 2, 2, 2, 3, 1, 1, 1, 1, 1,1, 1} 2, 2, 2, 2, 2, 2, 2} 2, 2, 3, 3, 3, 3, 3} 3, 3, 3, 4, 4, 4, 4}

According to the ‘sequential mapping method’, the mapped spatialrelation RS varies every each TU group. If N=16 and K=4, four TUs areincluded in one TU group. In this case, according to Table 12, themapped spatial relation RS varies every four TUs, i.e., every each TUgroup.

By considering advantages and disadvantages of the ‘full shufflingmethod’ and the ‘sequential mapping method’, a mapping method in a formof mutually complementing the corresponding methods may be considered.For example, when K=2 and N=8, the spatial relation RS may be mapped to{1, 1, 2, 2, 1, 1, 2, 2}. Therefore, the time diversity may be obtainedinstead of the ‘sequential mapping method’ according to Table 3 abovewhile reducing the number of times of changing the spatial relation RScompared with the ‘full shuffling method’ according to Table 2 above.The feature of the method is that the k-th TU group is comprised of aplurality of non-consecutive TU sub groups comprised of consecutive TUs.This method is referred to as a ‘hybrid mapping method’ for convenience.

According to the ‘hybrid mapping method’, the mapped spatial relation RSvaries every at least two TUs. For example, by assuming N=16 and K=4,respective mapping methods are hereinafter compared with each other.

According to the ‘full shuffling method’ (Table 12 above), the spatialrelation RS may be mapped like {1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1,2, 3, 4}.

According to the ‘sequential mapping method’ (Table 13 above), thespatial relation RS may be mapped like {1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3,3, 4, 4, 4, 4}.

According to the ‘hybrid mapping method’, the spatial relation RS may bemapped like {1, 1, 2, 2, 3, 3, 4, 4, 1, 1, 2, 2, 3, 3, 4, 4}.

The base station may configure, to the UE, one of various TU groupconfiguring methods (or spatial relation RS set mapping methods)(through the RRC message, etc.) as proposed above. Alternatively, a TUgroup configuring method suitable for a specific use case may bedefined.

As an example, it may be defined that when the TB is repeatedlytransmitted according to multi-TU scheduling (corresponding to a URLLCuse case), the full shuffling method is used and when the TB is notrepeatedly transmitted, the sequential mapping method is used.

As another example, it may be defined that when different TUs are to bemapped to consecutive symbols, the ‘sequential mapping’ is applied so asto prevent the beam from being (maximally) changed between adjacentsymbols and when different TUs are to be mapped to non-consecutivesymbols, the ‘full shuffling’ method is applied, which maximizes thediversity.

The UE may be configured with one of various TU group configuringmethods (or spatial relation RS set mapping methods) from the basestation (through the RRC message, etc.). Alternatively, a TU groupconfiguring method suitable for a specific use or a TU allocationsituation case may be defined.

In terms of implementation, the operations of the base station/UEaccording to the above-described embodiments (e.g., operations relatedto at least any one embodiments of Embodiments 1, 1-1, 1-2, 2, 2-1, 2-2or the mapping methods) may be processed by apparatuses (e.g.,processors 102 and 202 in FIG. 17) in FIGS. 16 to 20 to be describedbelow.

Further, the operations of the base station/UE according to theabove-described embodiments (e.g., operations related to at least anyone embodiment of Embodiments 1, 1-1, 1-2, 2, 2-1, 2-2 or the mappingmethod) may be stored in a memory (e.g., memories 104 and 204 in FIG.17) in the form of a command/program (e.g., instruction or executablecode) for driving at least one processor (e.g., 104 or 204 in FIG. 17).

Hereinafter, in FIG. 15, the method will be described in detail in termsof the operation of the base station that receives the PUSCH in thewireless communication system based on the above-described embodiments.

FIG. 15 is a flowchart for describing a method for receiving, by a basestation, a PUSCH according to an embodiment of the present disclosure.

Referring to FIG. 15, the method for receiving, by the base station, thePUSCH according to an embodiment of the present disclosure may include afirst message transmitting step related to the configuration of themulti-TU PUSCH (S1510), a second message transmitting step related tothe spatial relation RS applied to transmission of the multi-TU PUSCH(S1520), and a multi-TU PUSCH receiving step (S1530).

In S1510, the base station transmits, to the UE, a first messageincluding information related to a configuration of a PUSCH transmittedin a plurality of time units (TUs) (multi-TU PUSCH).

The first message may be a higher layer message (e.g., RRC message).

According to an embodiment, the plurality of time units (TUs) may beclassified into a plurality of TU groups.

According to an embodiment, the information related to the configurationof the multi-TU PUSCH may include at least one information of the numberN of the plurality of time units (TUs), the number K of the plurality ofTU groups, or TU grouping information. The TU grouping information maybe related to the number of TUs which belong to each TU group includedin the plurality of TU groups.

According to an embodiment, the information related to the configurationof the multi-TU PUSCH may include information related to a rule in whichat least one spatial relation RS is mapped to each of the TUs whichbelong to the plurality of TU groups. The rule may be a rule accordingto any one of the full shuffling method, the sequential mapping method,or the hybrid mapping method.

According to an embodiment, the time unit (TU) may be defined in unitsof a slot or a symbol.

According to an embodiment, the first message may further includeinformation related to the configuration of the spatial relation RS inorder to reduce signaling overhead required for indicating the spatialrelation RS for each TU group.

As an example, the first message may further include information on aplurality of spatial relation states. The first message may be a list ofthe plurality of spatial relation states. A constitution of each spatialrelation state included in the list is configured by a multiple accesscontrol (MAC) control element (CE). The spatial relation state may becomprised of at least one spatial relation RS applied to the pluralityof TU groups. The spatial relation state may be according to Embodiment1-1 described above.

As another example, the first message may further include information onthe spatial relation RSs applied to the plurality of TU groups. In thiscase, the indication of the spatial relation RS through the secondmessage may be omitted or a default spatial relation RS may beindicated. The example may be according to Embodiment 1-2 (Method 1)described above.

As yet another example, the first message may further includeinformation on remaining spatial relation RSs other than at least onespecific spatial relation RS of the spatial relation RSs applied to theplurality of TU groups. In this case, at least one specific spatialrelation RS excluded may be indicated through the second message. Theexample may be according to Embodiment 1-2 (Method 2) described above.

According to S1510 described above, the operation of the base station(100/200 in FIGS. 16 to 20) which transmits the first message related tothe configuration of the PUSCH transmitted in the plurality of timeunits (TUs) (multi-TU PUSCH) to the UE (100/200 in FIGS. 16 to 20) maybe implemented by the apparatuses of FIGS. 16 to 20. For example,referring to FIG. 17, one or more processors 202 may control one or moretransceivers 206 and/or one or more memories 204 so as to transmit, tothe UE 100, a first message related to the configuration of the PUSCHtransmitted in the plurality of time units (TUs) (multi-TU PUSCH).

In S1520, the base station transmits a second message related to aspatial relation RS applied to the transmission of the multi-TU PUSCH.

According to an embodiment, the second message may include informationindicating at least one spatial relation RS applied to each TU groupamong the plurality of TU groups.

At least one spatial relation RS may be a spatial relation RS setapplied to the each TU group. In other words, at least one spatialrelation RS may mean a set of one or a plurality of spatial relation RSsapplied to single TU PUSCH transmission.

According to an embodiment, at least one spatial relation RS applied tothe each TU group may be related to at least one layer of all layersrelated to the transmission of the multi-TU PUSCH.

As an example, at least one spatial relation RS may be applied to alllayers related to the transmission of the multi-TU PUSCH.

As another example, the all layers are classified into a plurality oflayer groups including at least one layer. At least one spatial relationRS may be applied to each layer group among the plurality of layergroups.

According to an embodiment, when the first message further includes alist of a plurality of spatial relation states, any one spatial relationstate may be determined by the second message. In other words,information indicating at least one spatial relation RS included in thesecond message may be related to any one spatial relation state of theplurality of spatial relation states. In this case, the second messagemay be Downlink Control Information (DCI). According to an embodiment,when the first message further includes the information on the spatialrelation RSs applied to the plurality of TU groups, the indication ofthe spatial relation RS may be omitted or the default spatial relationRS may be indicated through the second message. As a specific example,the information indicating at least one spatial relation included in thesecond message may indicate a spatial relation RS to beconfigured/applied as a default.

According to an embodiment, the second message may indicate an excludedspatial relation RS among the spatial relation RSs configured throughthe first message.

Specifically, the first message may further include information onremaining spatial relation RSs other than at least one specific spatialrelation RS of the spatial relation RSs applied to the plurality of TUgroups. In this case, at least one specific spatial relation RS excludedmay be indicated through the second message. The information indicatingat least one spatial relation RS included in the second message may berelated to at least one specific spatial relation RS. The specificspatial relation RS may be applied to a specific TU group among theplurality of TU groups. The example may be according to Embodiment 1-2(Method 2) described above.

According to an embodiment, at least one spatial relation RS may bemapped to TUs which belong to the each TU group.

As an example, the mapped spatial relation RS may be changed every eachTU among the TUs. The example may be according to the above-described‘full shuffling method’.

As another example, the mapped spatial relation RS may be changed everyeach TU group. The example may be according to the above-described‘sequential mapping method’.

As yet another example, the mapped spatial relation RS may be changedevery at least two TUs among the TUs. The example may be according tothe above-described ‘hybrid mapping method’.

According to an embodiment, the second message may be downlink controlinformation (DCI) for scheduling the transmission of the multi-TU PUSCHor may be downlink control information (DCI) or a multiple accesscontrol (MAC) control element (CE) for activating semi-persistenttransmission of the multi-TU PUSCH.

According to S1520 described above, the operation of the base station(100/200 in FIGS. 16 to 20) which transmits the second message relatedto the spatial relation RS applied to the transmission of the multi-TUPUSCH to the UE (100/200 in FIGS. 16 to 20) may be implemented by theapparatuses of FIGS. 16 to 20. For example, referring to FIG. 17, one ormore processors 202 may control one or more transceivers 206 and/or oneor more memories 204 so as to transmit, to the UE 100, the secondmessage related to the spatial relation RS applied to the transmissionof the multi-TU PUSCH to the UE 100.

In S1530, the base station receives the multi-TU PUSCH from the UE.

According to S1530 described above, the operation of the base station(100/200 in FIGS. 16 to 20) which receives the multi-TU PUSCH from theUE (100/200 in FIGS. 16 to 20) may be implemented by the apparatuses ofFIGS. 16 to 20. For example, referring to FIG. 17, one or moreprocessors 202 may control one or more transceivers 206 and/or one ormore memories 204 so as to receive, from the UE 100, the second messagerelated to the spatial relation RS applied to the multi-TU PUSCH.

Example of Communication System Applied to Present Disclosure

The various descriptions, functions, procedures, proposals, methods,and/or operational flowcharts of the present disclosure described inthis document may be applied to, without being limited to, a variety offields requiring wireless communication/connection (e.g., 5G) betweendevices.

Hereinafter, a description will be given in more detail with referenceto the drawings. In the following drawings/description, the samereference symbols may denote the same or corresponding hardware blocks,software blocks, or functional blocks unless described otherwise.

FIG. 16 illustrates a communication system 1 applied to the presentdisclosure.

Referring to FIG. 16, a communication system 1 applied to the presentdisclosure includes wireless devices, Base Stations (BSs), and anetwork. Herein, the wireless devices represent devices performingcommunication using Radio Access Technology (RAT) (e.g., 5G New RAT(NR)) or Long-Term Evolution (LTE)) and may be referred to ascommunication/radio/5G devices. The wireless devices may include,without being limited to, a robot 100 a, vehicles 100 b-1 and 100 b-2,an eXtended Reality (XR) device 100 c, a hand-held device 100 d, a homeappliance 100 e, an Internet of Things (IoT) device 100 f, and anArtificial Intelligence (AI) device/server 400. For example, thevehicles may include a vehicle having a wireless communication function,an autonomous driving vehicle, and a vehicle capable of performingcommunication between vehicles. Herein, the vehicles may include anUnmanned Aerial Vehicle (UAV) (e.g., a drone). The XR device may includean Augmented Reality (AR)/Virtual Reality (VR)/Mixed Reality (MR) deviceand may be implemented in the form of a Head-Mounted Device (HMD), aHead-Up Display (HUD) mounted in a vehicle, a television, a smartphone,a computer, a wearable device, a home appliance device, a digitalsignage, a vehicle, a robot, etc. The hand-held device may include asmartphone, a smartpad, a wearable device (e.g., a smartwatch or asmartglasses), and a computer (e.g., a notebook). The home appliance mayinclude a TV, a refrigerator, and a washing machine. The IoT device mayinclude a sensor and a smartmeter. For example, the BSs and the networkmay be implemented as wireless devices and a specific wireless device200 a may operate as a BS/network node with respect to other wirelessdevices.

The wireless devices 100 a to 100 f may be connected to the network 300via the BSs 200. An AI technology may be applied to the wireless devices100 a to 100 f and the wireless devices 100 a to 100 f may be connectedto the AI server 400 via the network 300. The network 300 may beconfigured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g.,NR) network. Although the wireless devices 100 a to 100 f maycommunicate with each other through the BSs 200/network 300, thewireless devices 100 a to 100 f may perform direct communication (e.g.,sidelink communication) with each other without passing through theBSs/network. For example, the vehicles 100 b-1 and 100 b-2 may performdirect communication (e.g. Vehicle-to-Vehicle(V2V)/Vehicle-to-everything (V2X) communication). The IoT device (e.g.,a sensor) may perform direct communication with other IoT devices (e.g.,sensors) or other wireless devices 100 a to 100 f.

Wireless communication/connections 150 a, 150 b, or 150 c may beestablished between the wireless devices 100 a to 100 f/BS 200, or BS200/BS 200. Herein, the wireless communication/connections may beestablished through various RATs (e.g., 5G NR) such as uplink/downlinkcommunication 150 a, sidelink communication 150 b (or, D2Dcommunication), or inter BS communication (e.g. relay, Integrated AccessBackhaul(IAB)). The wireless devices and the BSs/the wireless devicesmay transmit/receive radio signals to/from each other through thewireless communication/connections 150 a and 150 b. For example, thewireless communication/connections 150 a and 150 b may transmit/receivesignals through various physical channels. To this end, at least a partof various configuration information configuring processes, varioussignal processing processes (e.g., channel encoding/decoding,modulation/demodulation, and resource mapping/demapping), and resourceallocating processes, for transmitting/receiving radio signals, may beperformed based on the various proposals of the present disclosure.

Example of Wireless Device Applied to the Present Disclosure.

FIG. 17 illustrates wireless devices applicable to the presentdisclosure.

Referring to FIG. 17, a first wireless device 100 and a second wirelessdevice 200 may transmit radio signals through a variety of RATs (e.g.,LTE and NR). Herein, {the first wireless device 100 and the secondwireless device 200} may correspond to {the wireless device 100 x andthe BS 200} and/or {the wireless device 100 x and the wireless device100 x} of FIG. 16.

The first wireless device 100 may include one or more processors 102 andone or more memories 104 and additionally further include one or moretransceivers 106 and/or one or more antennas 108. The processor(s) 102may control the memory(s) 104 and/or the transceiver(s) 106 and may beconfigured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 102 may process informationwithin the memory(s) 104 to generate first information/signals and thentransmit radio signals including the first information/signals throughthe transceiver(s) 106. The processor(s) 102 may receive radio signalsincluding second information/signals through the transceiver 106 andthen store information obtained by processing the secondinformation/signals in the memory(s) 104. The memory(s) 104 may beconnected to the processor(s) 102 and may store a variety of informationrelated to operations of the processor(s) 102. For example, thememory(s) 104 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 102or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 102 and the memory(s) 104 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 106 may be connected to the processor(s) 102 andtransmit and/or receive radio signals through one or more antennas 108.Each of the transceiver(s) 106 may include a transmitter and/or areceiver. The transceiver(s) 106 may be interchangeably used with RadioFrequency (RF) unit(s). In the present disclosure, the wireless devicemay represent a communication modem/circuit/chip.

The second wireless device 200 may include one or more processors 202and one or more memories 204 and additionally further include one ormore transceivers 206 and/or one or more antennas 208. The processor(s)202 may control the memory(s) 204 and/or the transceiver(s) 206 and maybe configured to implement the descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument. For example, the processor(s) 202 may process informationwithin the memory(s) 204 to generate third information/signals and thentransmit radio signals including the third information/signals throughthe transceiver(s) 206. The processor(s) 202 may receive radio signalsincluding fourth information/signals through the transceiver(s) 106 andthen store information obtained by processing the fourthinformation/signals in the memory(s) 204. The memory(s) 204 may beconnected to the processor(s) 202 and may store a variety of informationrelated to operations of the processor(s) 202. For example, thememory(s) 204 may store software code including commands for performinga part or the entirety of processes controlled by the processor(s) 202or for performing the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.Herein, the processor(s) 202 and the memory(s) 204 may be a part of acommunication modem/circuit/chip designed to implement RAT (e.g., LTE orNR). The transceiver(s) 206 may be connected to the processor(s) 202 andtransmit and/or receive radio signals through one or more antennas 208.Each of the transceiver(s) 206 may include a transmitter and/or areceiver. The transceiver(s) 206 may be interchangeably used with RFunit(s). In the present disclosure, the wireless device may represent acommunication modem/circuit/chip.

Hereinafter, hardware elements of the wireless devices 100 and 200 willbe described more specifically. One or more protocol layers may beimplemented by, without being limited to, one or more processors 102 and202. For example, the one or more processors 102 and 202 may implementone or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP,RRC, and SDAP). The one or more processors 102 and 202 may generate oneor more Protocol Data Units (PDUs) and/or one or more Service Data Unit(SDUs) according to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document. Theone or more processors 102 and 202 may generate messages, controlinformation, data, or information according to the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document. The one or more processors 102 and 202 maygenerate signals (e.g., baseband signals) including PDUs, SDUs,messages, control information, data, or information according to thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document and provide thegenerated signals to the one or more transceivers 106 and 206. The oneor more processors 102 and 202 may receive the signals (e.g., basebandsignals) from the one or more transceivers 106 and 206 and acquire thePDUs, SDUs, messages, control information, data, or informationaccording to the descriptions, functions, procedures, proposals,methods, and/or operational flowcharts disclosed in this document.

The one or more processors 102 and 202 may be referred to ascontrollers, microcontrollers, microprocessors, or microcomputers. Theone or more processors 102 and 202 may be implemented by hardware,firmware, software, or a combination thereof. As an example, one or moreApplication Specific Integrated Circuits (ASICs), one or more DigitalSignal Processors (DSPs), one or more Digital Signal Processing Devices(DSPDs), one or more Programmable Logic Devices (PLDs), or one or moreField Programmable Gate Arrays (FPGAs) may be included in the one ormore processors 102 and 202. The descriptions, functions, procedures,proposals, methods, and/or operational flowcharts disclosed in thisdocument may be implemented using firmware or software and the firmwareor software may be configured to include the modules, procedures, orfunctions. Firmware or software configured to perform the descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be included in the one or more processors102 and 202 or stored in the one or more memories 104 and 204 so as tobe driven by the one or more processors 102 and 202. The descriptions,functions, procedures, proposals, methods, and/or operational flowchartsdisclosed in this document may be implemented using firmware or softwarein the form of code, commands, and/or a set of commands.

The one or more memories 104 and 204 may be connected to the one or moreprocessors 102 and 202 and store various types of data, signals,messages, information, programs, code, instructions, and/or commands.The one or more memories 104 and 204 may be configured by Read-OnlyMemories (ROMs), Random Access Memories (RAMs), Electrically ErasableProgrammable Read-Only Memories (EPROMs), flash memories, hard drives,registers, cash memories, computer-readable storage media, and/orcombinations thereof. The one or more memories 104 and 204 may belocated at the interior and/or exterior of the one or more processors102 and 202. The one or more memories 104 and 204 may be connected tothe one or more processors 102 and 202 through various technologies suchas wired or wireless connection.

The one or more transceivers 106 and 206 may transmit user data, controlinformation, and/or radio signals/channels, mentioned in the methodsand/or operational flowcharts of this document, to one or more otherdevices. The one or more transceivers 106 and 206 may receive user data,control information, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, from one or moreother devices. For example, the one or more transceivers 106 and 206 maybe connected to the one or more processors 102 and 202 and transmit andreceive radio signals. For example, the one or more processors 102 and202 may perform control so that the one or more transceivers 106 and 206may transmit user data, control information, or radio signals to one ormore other devices. The one or more processors 102 and 202 may performcontrol so that the one or more transceivers 106 and 206 may receiveuser data, control information, or radio signals from one or more otherdevices. The one or more transceivers 106 and 206 may be connected tothe one or more antennas 108 and 208 and the one or more transceivers106 and 206 may be configured to transmit and receive user data, controlinformation, and/or radio signals/channels, mentioned in thedescriptions, functions, procedures, proposals, methods, and/oroperational flowcharts disclosed in this document, through the one ormore antennas 108 and 208. In this document, the one or more antennasmay be a plurality of physical antennas or a plurality of logicalantennas (e.g., antenna ports). The one or more transceivers 106 and 206may convert received radio signals/channels etc. from RF band signalsinto baseband signals in order to process received user data, controlinformation, radio signals/channels, etc. using the one or moreprocessors 102 and 202. The one or more transceivers 106 and 206 mayconvert the user data, control information, radio signals/channels, etc.processed using the one or more processors 102 and 202 from the baseband signals into the RF band signals. To this end, the one or moretransceivers 106 and 206 may include (analog) oscillators and/orfilters.

Example of Signal Processing Circuit Applied to the Present Disclosure

FIG. 18 illustrates a signal process circuit for a transmission signal.

Referring to FIG. 18, a signal processing circuit 1000 may includescramblers 1010, modulators 1020, a layer mapper 1030, a precoder 1040,resource mappers 1050, and signal generators 1060. An operation/functionof FIG. 18 may be performed, without being limited to, the processors102 and 202 and/or the transceivers 106 and 206 of FIG. 17. Hardwareelements of FIG. 18 may be implemented by the processors 102 and 202and/or the transceivers 106 and 206 of FIG. 17. For example, blocks 1010to 1060 may be implemented by the processors 102 and 202 of FIG. 17.Alternatively, the blocks 1010 to 1050 may be implemented by theprocessors 102 and 202 of FIG. 17 and the block 1060 may be implementedby the transceivers 106 and 206 of FIG. 17.

Codewords may be converted into radio signals via the signal processingcircuit 1000 of FIG. 18. Herein, the codewords are encoded bit sequencesof information blocks. The information blocks may include transportblocks (e.g., a UL-SCH transport block, a DL-SCH transport block). Theradio signals may be transmitted through various physical channels(e.g., a PUSCH and a PDSCH).

Specifically, the codewords may be converted into scrambled bitsequences by the scramblers 1010. Scramble sequences used for scramblingmay be generated based on an initialization value, and theinitialization value may include ID information of a wireless device.The scrambled bit sequences may be modulated to modulation symbolsequences by the modulators 1020. A modulation scheme may includepi/2-Binary Phase Shift Keying (pi/2-BPSK), m-Phase Shift Keying(m-PSK), and m-Quadrature Amplitude Modulation (m-QAM). Complexmodulation symbol sequences may be mapped to one or more transportlayers by the layer mapper 1030. Modulation symbols of each transportlayer may be mapped (precoded) to corresponding antenna port(s) by theprecoder 1040. Outputs z of the precoder 1040 may be obtained bymultiplying outputs y of the layer mapper 1030 by an N*M precodingmatrix W. Herein, N is the number of antenna ports and M is the numberof transport layers. The precoder 1040 may perform precoding afterperforming transform precoding (e.g., DFT) for complex modulationsymbols. Alternatively, the precoder 1040 may perform precoding withoutperforming transform precoding.

The resource mappers 1050 may map modulation symbols of each antennaport to time-frequency resources. The time-frequency resources mayinclude a plurality of symbols (e.g., a CP-OFDMA symbols and DFT-s-OFDMAsymbols) in the time domain and a plurality of subcarriers in thefrequency domain. The signal generators 1060 may generate radio signalsfrom the mapped modulation symbols and the generated radio signals maybe transmitted to other devices through each antenna. For this purpose,the signal generators 1060 may include Inverse Fast Fourier Transform(IFFT) modules, Cyclic Prefix (CP) inserters, Digital-to-AnalogConverters (DACs), and frequency up-converters.

Signal processing procedures for a signal received in the wirelessdevice may be configured in a reverse manner of the signal processingprocedures 1010 to 1060 of FIG. 18. For example, the wireless devices(e.g., 100 and 200 of FIG. 17) may receive radio signals from theexterior through the antenna ports/transceivers. The received radiosignals may be converted into baseband signals through signal restorers.To this end, the signal restorers may include frequency downlinkconverters, Analog-to-Digital Converters (ADCs), CP remover, and FastFourier Transform (FFT) modules. Next, the baseband signals may berestored to codewords through a resource demapping procedure, apostcoding procedure, a demodulation processor, and a descramblingprocedure. The codewords may be restored to original information blocksthrough decoding. Therefore, a signal processing circuit (notillustrated) for a reception signal may include signal restorers,resource demappers, a postcoder, demodulators, descramblers, anddecoders.

Example of Application of Wireless Device Applied to the PresentDisclosure

FIG. 19 illustrates another example of a wireless device applied to thepresent disclosure.

The wireless device may be implemented in various forms according to ause-case/service (refer to FIG. 16). Referring to FIG. 19, wirelessdevices 100 and 200 may correspond to the wireless devices 100 and 200of FIG. 17 and may be configured by various elements, components,units/portions, and/or modules. For example, each of the wirelessdevices 100 and 200 may include a communication unit 110, a control unit120, a memory unit 130, and additional components 140. The communicationunit may include a communication circuit 112 and transceiver(s) 114. Forexample, the communication circuit 112 may include the one or moreprocessors 102 and 202 and/or the one or more memories 104 and 204 ofFIG. 17. For example, the transceiver(s) 114 may include the one or moretransceivers 106 and 206 and/or the one or more antennas 108 and 208 ofFIG. 17. The control unit 120 is electrically connected to thecommunication unit 110, the memory 130, and the additional components140 and controls overall operation of the wireless devices. For example,the control unit 120 may control an electric/mechanical operation of thewireless device based on programs/code/commands/information stored inthe memory unit 130. The control unit 120 may transmit the informationstored in the memory unit 130 to the exterior (e.g., other communicationdevices) via the communication unit 110 through a wireless/wiredinterface or store, in the memory unit 130, information received throughthe wireless/wired interface from the exterior (e.g., othercommunication devices) via the communication unit 110.

The additional components 140 may be variously configured according totypes of wireless devices. For example, the additional components 140may include at least one of a power unit/battery, input/output (I/O)unit, a driving unit, and a computing unit. The wireless device may beimplemented in the form of, without being limited to, the robot (100 aof FIG. 16), the vehicles (100 b-1 and 100 b-2 of FIG. 16), the XRdevice (100 c of FIG. 16), the hand-held device (100 d of FIG. 16), thehome appliance (100 e of FIG. 16), the IoT device (100 f of FIG. 16), adigital broadcast terminal, a hologram device, a public safety device,an MTC device, a medicine device, a fintech device (or a financedevice), a security device, a climate/environment device, the AIserver/device (400 of FIG. 16), the BSs (200 of FIG. 16), a networknode, etc. The wireless device may be used in a mobile or fixed placeaccording to a use-example/service.

In FIG. 19, the entirety of the various elements, components,units/portions, and/or modules in the wireless devices 100 and 200 maybe connected to each other through a wired interface or at least a partthereof may be wirelessly connected through the communication unit 110.For example, in each of the wireless devices 100 and 200, the controlunit 120 and the communication unit 110 may be connected by wire and thecontrol unit 120 and first units (e.g., 130 and 140) may be wirelesslyconnected through the communication unit 110. Each element, component,unit/portion, and/or module within the wireless devices 100 and 200 mayfurther include one or more elements. For example, the control unit 120may be configured by a set of one or more processors. As an example, thecontrol unit 120 may be configured by a set of a communication controlprocessor, an application processor, an Electronic Control Unit (ECU), agraphical processing unit, and a memory control processor. As anotherexample, the memory 130 may be configured by a Random Access Memory(RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM)), a flash memory,a volatile memory, a non-volatile memory, and/or a combination thereof.

Example of Hand-Held Device Applied to the Present Disclosure

FIG. 20 illustrates a hand-held device applied to the presentdisclosure.

The hand-held device may include a smartphone, a smartpad, a wearabledevice (e.g., a smartwatch or a smartglasses), or a portable computer(e.g., a notebook). The hand-held device may be referred to as a mobilestation (MS), a user terminal (UT), a Mobile Subscriber Station (MSS), aSubscriber Station (SS), an Advanced Mobile Station (AMS), or a WirelessTerminal (WT).

Referring to FIG. 20, a hand-held device 100 may include an antenna unit108, a communication unit 110, a control unit 120, a memory unit 130, apower supply unit 140 a, an interface unit 140 b, and an I/O unit 140 c.The antenna unit 108 may be configured as a part of the communicationunit 110. Blocks 110 to 130/140 a to 140 c correspond to the blocks 110to 130/140 of FIG. 19, respectively.

The communication unit 110 may transmit and receive signals (e.g., dataand control signals) to and from other wireless devices or BSs. Thecontrol unit 120 may perform various operations by controllingconstituent elements of the hand-held device 100. The control unit 120may include an Application Processor (AP). The memory unit 130 may storedata/parameters/programs/code/commands needed to drive the hand-helddevice 100. The memory unit 130 may store input/output data/information.The power supply unit 140 a may supply power to the hand-held device 100and include a wired/wireless charging circuit, a battery, etc. Theinterface unit 140 b may support connection of the hand-held device 100to other external devices. The interface unit 140 b may include variousports (e.g., an audio I/O port and a video I/O port) for connection withexternal devices. The I/O unit 140 c may input or output videoinformation/signal s, audio information/signal s, data, and/orinformation input by a user. The I/O unit 140 c may include a camera, amicrophone, a user input unit, a display unit 140 d, a speaker, and/or ahaptic module.

As an example, in the case of data communication, the I/O unit 140 c mayacquire information/signals (e.g., touch, text, voice, images, or video)input by a user and the acquired information/signals may be stored inthe memory unit 130. The communication unit 110 may convert theinformation/signals stored in the memory into radio signals and transmitthe converted radio signals to other wireless devices directly or to aBS. The communication unit 110 may receive radio signals from otherwireless devices or the BS and then restore the received radio signalsinto original information/signals. The restored information/signals maybe stored in the memory unit 130 and may be output as various types(e.g., text, voice, images, video, or haptic) through the I/O unit 140c.

Effects of the method for receiving the PUSCH in the wirelesscommunication system and the apparatus therefore according to anembodiment of the present disclosure are described below.

According to an embodiment of the present disclosure, in relation to aconfiguration of a multi-TU PUSCH transmitted in a plurality of timeunits (TUs), the plurality of TUs are classified into a plurality of TUgroups. The base station may indicate at least one spatial relation RSapplied to the transmission of the multi-TU PUSCH every each TU group.The base station may receive a PUSCH through different beams for each TUgroup. Accordingly, the present disclosure can increase a communicationsuccess probability even when a quality of a link between a specifictransmission beam of a UE and the base station deteriorates.

Further, according to an embodiment of the present disclosure, a spatialrelation RS applied for each TU group can be sequentially indicatedthrough a first message and a second message. A signaling overheadrequired for indicating the spatial relation RS can be reduced.

Further, according to an embodiment of the present disclosure, thespatial relation RS for the plurality of TU groups is mapped accordingto a specific mapping rule. Therefore, a spatial relation RS indicatedfor receiving the multi-TU PUSCH can be mapped to each TU (group) tosuit a UE capability related to a beam switching delay, a powerswitching time, etc.

The embodiments of the present disclosure described hereinbelow arecombinations of elements and features of the present disclosure. Theelements or features may be considered selective unless otherwisementioned. Each element or feature may be practiced without beingcombined with other elements or features. Further, an embodiment of thepresent disclosure may be constructed by combining parts of the elementsand/or features. Operation orders described in embodiments of thepresent disclosure may be rearranged. Some constructions of any oneembodiment may be included in another embodiment and may be replacedwith corresponding constructions of another embodiment. It is obvious tothose skilled in the art that claims that are not explicitly cited ineach other in the appended claims may be presented in combination as anembodiment of the present disclosure or included as a new claim bysubsequent amendment after the application is filed.

The embodiments of the present disclosure may be achieved by variousmeans, for example, hardware, firmware, software, or a combinationthereof. In a hardware configuration, the methods according to theembodiments of the present disclosure may be achieved by one or moreApplication Specific Integrated Circuits (ASICs), Digital SignalProcessors (DSPs), Digital Signal Processing Devices (DSPDs),Programmable Logic Devices (PLDs), Field Programmable Gate Arrays(FPGAs), processors, controllers, microcontrollers, microprocessors,etc.

In a firmware or software configuration, the embodiments of the presentdisclosure may be implemented in the form of a module, a procedure, afunction, etc. For example, software code may be stored in a memory unitand executed by a processor. The memories may be located at the interioror exterior of the processors and may transmit data to and receive datafrom the processors via various known means.

Those skilled in the art will appreciate that the present disclosure maybe carried out in other specific ways than those set forth hereinwithout departing from the spirit and essential characteristics of thepresent disclosure. The above embodiments are therefore to be construedin all aspects as illustrative and not restrictive. The scope of thedisclosure should be determined by the appended claims and their legalequivalents, not by the above description, and all changes coming withinthe meaning and equivalency range of the appended claims are intended tobe embraced therein.

1. A method for receiving, by a base station, a Physical Uplink SharedChannel (PUSCH) in a wireless communication system, the methodcomprising: transmitting a first message including information relatedto a configuration of a multi-TU PUSCH transmitted in a plurality oftime units (TUs); transmitting a second message related to a spatialrelation RS applied to the transmission of the multi-TU PUSCH; andreceiving the multi-TU PUSCH, wherein the plurality of time units (TUs)are classified into a plurality of TU groups, and wherein the secondmessage includes information indicating at least one spatial relation RSapplied to each TU group among the plurality of TU groups.
 2. The methodof claim 1, wherein the time unit (TU) is defined in units of a slot ora symbol.
 3. The method of claim 2, wherein at least one spatialrelation RS applied to the each TU group is related to at least onelayer of all layers related to the transmission of the multi-TU PUSCH.4. The method of claim 3, wherein the all layers are classified into aplurality of layer groups including at the at least one layer, andwherein at least one spatial relation RS applied to each TU group isapplied to each layer group among the plurality of layer groups.
 5. Themethod of claim 3, wherein at least one spatial relation RS applied tothe each TU group is applied to the all layers.
 6. The method of claim1, wherein the first message further includes a list of a plurality ofrelation states, wherein a constitution of each spatial relation stateincluded in the list is configured by a multiple access control-controlelement (MAC CE), and wherein the spatial relation state is comprised ofat least one spatial relation RS applied to the plurality of TU groups.7. The method of claim 6, wherein the second message is Downlink ControlInformation (DCI), and wherein the information indicating at least onespatial relation RS is related to any one spatial relation state of theplurality of spatial relation states.
 8. The method of claim 1, whereinthe first message further includes information of spatial relation RSsapplied to the plurality of TU groups, and wherein the informationindicating at least one spatial relation RS indicates a spatial relationRS to be applied as a default.
 9. The method of claim 1, wherein thefirst message further includes information on remaining spatial relationRSs other than at least one specific spatial relation RS of the spatialrelation RSs applied to the plurality of TU groups, and wherein theinformation indicating at least one spatial relation RS is related tothe at least one specific spatial relation RS, and the specific spatialrelation RS is applied to a specific TU group of the plurality of TUgroups.
 10. The method of claim 1, wherein the at least one spatialrelation RS is mapped to TUs which belong to the each TU group and themapped spatial relation RS is changed for each TU among the TUs.
 11. Themethod of claim 1, wherein the at least one spatial relation RS ismapped to the TUs which belong to the each TU group and the mappedspatial relation RS is changed for each TU group.
 12. The method ofclaim 1, wherein the at least one spatial relation RS is mapped to theTUs which belong to the each TU group and the mapped spatial relation RSis changed every at least two TUs of the TUs.
 13. The method of claim 1,wherein the second message is Downlink Control Information (DCI) forscheduling the transmission of the multi-TU PUSCH, or Downlink controlinformation (DCI) or a Multiple Access Control (MAC) Control Element(CE) for activating semi-persistent transmission of the multi-TU PUSCH.14. A base station for receiving a Physical Uplink Shared Channel(PUSCH) in a wireless communication system, the base station comprising:one or more transceivers; one or more processors; and one or morememories operably connectable to the one or more processors, and storinginstructions of performing operations when executed by the one or moreprocessors, wherein the operations comprise: transmitting a firstmessage including information related to a configuration of a multi-TUPUSCH transmitted in a plurality of time units (TUs), transmitting asecond message related to a spatial relation RS applied to thetransmission of the multi-TU PUSCH, and receiving the multi-TU PUSCH,wherein the plurality of time units (TUs) are classified into aplurality of TU groups, and wherein the second message includesinformation indicating at least one spatial relation RS applied to eachTU group among the plurality of TU groups.
 15. The base station of claim14, wherein the time unit (TU) is defined in units of a slot or asymbol.
 16. An apparatus comprising: one or more memories; and one ormore processors functionally connected to the one or more memories,wherein the one or more processors are configured to control theapparatus to: transmit a first message including information related toa configuration of a multi-TU PUSCH transmitted in a plurality of timeunits (TUs), transmit a second message related to a spatial relation RSapplied to the transmission of the multi-TU PUSCH, and receive themulti-TU PUSCH, wherein the plurality of time units (TUs) are classifiedinto a plurality of TU groups, and wherein the second message includesinformation indicating at least one spatial relation RS applied to eachTU group among the plurality of TU groups.